| 释义 |
radical
rad·i·cal R0012000 (răd′ĭ-kəl)adj.1. Arising from or going to a root or source; basic: proposed a radical solution to the problem.2. Departing markedly from the usual or customary; extreme or drastic: a radical change in diet.3. Relating to or advocating fundamental or revolutionary changes in current practices, conditions, or institutions: radical politics; a radical political theorist.4. Medicine Relating to or being surgery that is extreme or drastic in an effort to eradicate all existing or potential disease: radical hysterectomy.5. Linguistics Of or being a root: a radical form.6. Botany a. Of, relating to, or arising from a root: radical hairs.b. Arising from the base of a stem or from a below-ground stem or rhizome: radical leaves.7. Slang Excellent; wonderful.n.1. One who advocates fundamental or revolutionary changes in current practices, conditions, or institutions: radicals seeking to overthrow the social order.2. Mathematics The root of a quantity as indicated by the radical sign.3. Symbol R An atom or a group of atoms with one unpaired electron.4. Linguistics See root1.5. a. Any of the basic Chinese characters that are combined to form more complex characters.b. Any of the traditional set of basic strokes or groups of strokes that make up Chinese characters and are used to classify and organize them in dictionaries.
[Middle English, of a root, from Late Latin rādīcālis, having roots, from Latin rādīx, rādīc-, root; see wrād- in Indo-European roots.]
rad′i·cal·ly adv.rad′i·cal·ness n.radical (ˈrædɪkəl) adj1. of, relating to, or characteristic of the basic or inherent constitution of a person or thing; fundamental: a radical fault. 2. concerned with or tending to concentrate on fundamental aspects of a matter; searching or thoroughgoing: radical thought; a radical re-examination. 3. (Government, Politics & Diplomacy) favouring or tending to produce extreme or fundamental changes in political, economic, or social conditions, institutions, habits of mind, etc: a radical party. 4. (Medicine) med (of treatment) aimed at removing the source of a disease: radical surgery. 5. slang chiefly US very good; excellent6. (Botany) of, relating to, or arising from the root or the base of the stem of a plant: radical leaves. 7. (Mathematics) maths of, relating to, or containing roots of numbers or quantities8. (Linguistics) linguistics of or relating to the root of a wordn9. (Government, Politics & Diplomacy) a person who favours extreme or fundamental change in existing institutions or in political, social, or economic conditions10. (Mathematics) maths a root of a number or quantity, such as 3√5, √x11. (Chemistry) chem a. short for free radicalb. another name for group1012. (Linguistics) linguistics another word for root1913. (Linguistics) (in logographic writing systems such as that used for Chinese) a part of a character conveying lexical meaning[C14: from Late Latin rādīcālis having roots, from Latin rādix a root] ˈradicalness nrad•i•cal (ˈræd ɪ kəl)
adj. 1. of or going to the root or origin; fundamental. 2. thoroughgoing or extreme: a radical change in company policy. 3. favoring drastic political, economic, or social reforms. 4. existing inherently in a thing or person: radical defects of character. 5. Math. a. pertaining to or forming a root. b. denoting or pertaining to the radical sign. c. irrational (def. 4b). 6. of or pertaining to the root of a word. 7. Bot. of or arising from the root or the base of the stem. 8. Slang. great; marvelous; wonderful. n. 9. a person who holds or follows strong convictions or extreme principles; extremist. 10. a person who advocates fundamental political, economic, and social reforms by direct and often uncompromising methods. 11. Math. a. a quantity expressed as a root of another quantity. b. radical sign. 12. Chem. a. group (def. 3). b. free radical. 13. root 1 (def. 10). [1350–1400; Middle English < Late Latin rādīcālis having roots < Latin rādīc- (s. of rādīx) root1] rad·i·cal (răd′ĭ-kəl)1. A root, such as √2, especially as indicated by a radical sign (√).2. A group of atoms that behaves as a unit in chemical reactions and is often not stable except as part of a molecule. The hydroxyl, ethyl, and phenyl radicals are examples. Radicals are unchanged by chemical reactions.radicalA group of atoms forming part of many molecules. They are very reactive as they have an incomplete electron structure.Thesaurus| Noun | 1. | radical - (chemistry) two or more atoms bound together as a single unit and forming part of a moleculechemical group, groupchemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactionsbuilding block, unit - a single undivided natural thing occurring in the composition of something else; "units of nucleic acids"acyl, acyl group - any group or radical of the form RCO- where R is an organic group; "an example of the acyl group is the acetyl group"alcohol group, alcohol radical - the chemical group -OHaldehyde group, aldehyde radical - the chemical group -CHOalkyl, alkyl group, alkyl radical - any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbonsallyl, allyl group, allyl radical - the univalent unsaturated organic radical C3H5; derived from propyleneamino, amino group - the radical -NH2amyl - a hydrocarbon radical that occurs in many organic compoundsazido group, azido radical - the univalent group N3- derived from hydrazoic acidazo group, azo radical - the bivalent group -N=N- united to two hydrocarbon groupsbenzyl, benzyl group, benzyl radical - the univalent radical derived from toluenebenzoyl group, benzoyl radical - the univalent radical derived from benzoic acidmolecule - (physics and chemistry) the simplest structural unit of an element or compoundarsenic group, cacodyl group, cacodyl radical, cacodyl - the univalent group derived from arsinecarbonyl group - the bivalent radical COcarboxyl, carboxyl group - the univalent radical -COOH; present in and characteristic of organic acidschromophore - the chemical group that gives color to a moleculecyanide group, cyanide radical, cyano group, cyano radical - the monovalent group -CN in a chemical compoundglyceryl - a trivalent radical derived from glycerol by removing the three hydroxyl radicalshydrazo group, hydrazo radical - the bivalent group -HNNH- derived from hydrazinehydroxyl, hydroxyl group, hydroxyl radical - the monovalent group -OH in such compounds as bases and some acids and alcoholsketone group - a group having the characteristic properties of ketonesmethylene, methylene group, methylene radical - the bivalent radical CH2 derived from methanepropyl, propyl group, propyl radical - the monovalent organic group C3H7- obtained from propanebutyl - a hydrocarbon radical (C4H9)nitro group - the group -NO3nitrite - the radical -NO2 or any compound containing it (such as a salt or ester of nitrous acid)uranyl, uranyl group, uranyl radical - the bivalent radical UO2 which forms salts with acidsvinyl, vinyl group, vinyl radical - a univalent chemical radical derived from ethylene | | 2. | radical - an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule; "in the body free radicals are high-energy particles that ricochet wildly and damage cells"free radicalatom - (physics and chemistry) the smallest component of an element having the chemical properties of the element | | 3. | radical - a person who has radical ideas or opinionsindividual, mortal, person, somebody, someone, soul - a human being; "there was too much for one person to do"anarchist, syndicalist, nihilist - an advocate of anarchismBolshevik, bolshie, bolshy, Marxist, red - emotionally charged terms used to refer to extreme radicals or revolutionariesextremist - a person who holds extreme viewsleveler, leveller - a radical who advocates the abolition of social distinctionsrevolutionary, revolutionist, subversive, subverter - a radical supporter of political or social revolutionterrorist - a radical who employs terror as a political weapon; usually organizes with other terrorists in small cells; often uses religion as a cover for terrorist activitiesTrotskyist, Trotskyite, Trot - radicals who support Trotsky's theory that socialism must be established throughout the world by continuing revolutionWobbly - a member of the Industrial Workers of the Worldyoung Turk - a young radical who agitates for reform | | 4. | radical - (mathematics) a quantity expressed as the root of another quantityquantity, measure, amount - how much there is or how many there are of something that you can quantifymath, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement | | 5. | radical - a character conveying the lexical meaning of a logogramgrapheme, graphic symbol, character - a written symbol that is used to represent speech; "the Greek alphabet has 24 characters"ideogram, ideograph - a graphic character that indicates the meaning of a thing without indicating the sounds used to say it; "Chinese characters are ideograms" | | 6. | radical - (linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem"root word, stem, root, theme, baselinguistics - the scientific study of languagedescriptor, form, signifier, word form - the phonological or orthographic sound or appearance of a word that can be used to describe or identify something; "the inflected forms of a word can be represented by a stem and a list of inflections to be attached" | | Adj. | 1. |  radical - (used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative"extremist, ultraimmoderate - beyond reasonable limits; "immoderate laughter"; "immoderate spending" | | 2. | radical - markedly new or introducing radical change; "a revolutionary discovery"; "radical political views"revolutionarynew - not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered; "a new law"; "new cars"; "a new comet"; "a new friend"; "a new year"; "the New World" | | 3. | radical - arising from or going to the root or source; "a radical flaw in the plan"basic - pertaining to or constituting a base or basis; "a basic fact"; "the basic ingredients"; "basic changes in public opinion occur because of changes in priorities" | | 4. | radical - of or relating to or constituting a linguistic root; "a radical verb form"linguistics - the scientific study of language | | 5. | radical - especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem; "basal placentation"; "radical leaves"basalphytology, botany - the branch of biology that studies plantscauline - especially of leaves; growing on a stem especially on the upper part of a stem; "cauline leaves" |
radicaladjective1. extreme, complete, entire, sweeping, violent, severe, extensive, wide-ranging, excessive, thorough, drastic, rigorous, far-reaching, draconian periods of radical change2. revolutionary, reforming, extreme, militant, progressive, left-wing, extremist, reformist, fanatical political tension between radical and conservative politicians3. fundamental, natural, basic, essential, native, constitutional, organic, profound, innate, deep-seated, thoroughgoing, hard-wired the radical differences between them
fundamental minor, token, trivial, superficial, insignificantnoun1. extremist, revolutionary, militant, reformer, fanatic, left-winger, zealot, revisionist a former left-wing radical who was involved with the civil rights movement
extremist conservative, moderate, reactionaryQuotations
"A radical is a man with both feet firmly planted in the air" [Franklin D. Roosevelt radio broadcast]radicaladjective1. Arising from or going to the root or source:basal, basic, foundational, fundamental, original, primary, underlying.2. Holding especially political views that deviate drastically and fundamentally from conventional or traditional beliefs:extreme, extremist, fanatic, fanatical, rabid, revolutionary, ultra.Slang: far-out.nounOne who holds extreme views or advocates extreme measures:extremist, fanatic, revolutionary, revolutionist, ultra, zealot.Translationsradical (ˈrӕdikəl) adjective1. relating to the basic nature of something. radical faults in the design. 根本的 基本的2. thorough; complete. radical changes. 徹底的 根本的3. wanting or involving great or extreme political, social or economic changes. 激進的 激进的 noun a person who wants radical political changes. 激進份子 激进分子ˈradically adverb 根本上，徹底地，激進地 根本地，彻底地，完全地根本上
radical
radicalslang Exceptionally good, excellent, cool, or exciting. That was a pretty radical concert! Wow, radical—a new bicycle! Thanks, Mom and Dad!radical mod. great; excellent. (California.) My boyfriend, he’s, like, so radical! radical
radical, in chemistry, group of atoms that are joined together in some particular spatial structure and that take part in most chemical reactions as a single unit. Important inorganic radicals include ammonium, NH4; carbonate, CO3 ; chlorate, ClO3, and perchlorate, ClO4 ; cyanide, CN; hydroxide, OH; nitrate, NO3; phosphate, PO4; silicate, SiO3 (meta) or SiO4 (ortho); and sulfate, SO4. The use of these radicals simplifies the naming and description of inorganic compounds, since such usage does not consider the electronic charge on the group. (When ionsion,
atom or group of atoms having a net electric charge. Positive and Negative Electric Charges
A neutral atom or group of atoms becomes an ion by gaining or losing one or more electrons or protons.
..... Click the link for more information. are dealt with, electronic charge must be considered.) In organic chemistry, the term radical is sometimes used synonymously with group; e.g., the group CH3 is sometimes called the methyl radical instead of the methyl group. This use is limited chiefly to alkyl groupsalkyl group
, in chemistry, group of carbon and hydrogen atoms derived from an alkane molecule by removing one hydrogen atom (see radical). The name of the alkyl group is derived from the name of its alkane by replacing the -ane suffix with -yl, e.g.
..... Click the link for more information. and aryl groupsaryl group
, in chemistry, group of atoms derived from benzene or from a benzene derivative by removing one hydrogen that is bonded to the benzene ring (see radical). The simplest aryl group is phenyl, C6H5 ; it is derived from benzene.
..... Click the link for more information. ; it is usually not applied to functional groupsfunctional group,
in organic chemistry, group of atoms within a molecule that is responsible for certain properties of the molecule and reactions in which it takes part. Organic compounds are frequently classified according to the functional group or groups they contain.
..... Click the link for more information. , such as carbonyl. Because the term radical easily could be taken to mean a free radicalfree radical,
in chemistry, a molecule or atom that contains an unpaired electron but is neither positively nor negatively charged. Free radicals are usually highly reactive and unstable. They are produced by homolytic cleavage of a covalent bond (see chemical bond); i.e.
..... Click the link for more information. , the term group is preferred by some.
radical, in mathematics, symbol (√) placed over a number or expression, called the radicand, to indicate a rootroot,
in mathematics, number or quantity r for which an equation f(r)=0 holds true, where f is some function. If f is a polynomial, r is called a root of f; for example, r=3 and r
..... Click the link for more information. of the radicand. When used without a sign or index number, as in √4, it designates the positive square root of the radicand, i.e., 2. If both square roots are meant, the radical sign is preceded by ±, as in ±√4. To indicate higher roots of the radicand, e.g., cube or fourth roots, an index number is used, as in ∛27. The radical sign is generally taken to indicate the principal root of the radicand, i.e., ∛27 = 3, although any radicand will have n different nth roots. The term radical is sometimes used loosely to refer to the entire expression consisting of radical sign and radicand.Radical (religion, spiritualism, and occult)Radical is an adjective form of the noun radix, as in the “radical” position of the planets, meaning their original position in a horoscope chart. Radical (1) In capitalist countries, a member of a political party that demands in its program bourgeois-democratic reforms within the framework of the existing system. (2) One who advocates a radical solution to problems. radical[′rad·ə·kəl] (botany) Of, pertaining to, or proceeding from the root. Arising from the base of a stem or from an underground stem. (mathematics) In a ring, the intersection of all maximal ideals. Also known as Jacobson radical. An indicated root of a quantity. Symbolized √. nilradical (organic chemistry) free radical radical1. favouring or tending to produce extreme or fundamental changes in political, economic, or social conditions, institutions, habits of mind, etc 2. Med (of treatment) aimed at removing the source of a disease 3. of, relating to, or arising from the root or the base of the stem of a plant 4. Maths of, relating to, or containing roots of numbers or quantities 5. a person who favours extreme or fundamental change in existing institutions or in political, social, or economic conditions 6. Maths a root of a number or quantity, such as 3ÝA5, ÝAx 7. Chema. short for free radicalb. another name for groupradical
radical [rad´ĭ-kal] 1. thorough or sweeping; directed to the cause or root of a morbid process.2. a group of atoms that enters into and goes out of chemical combination without change and that forms one of the fundamental constituents of a molecule.color radical chromophore.free radical a radical that carries an unpaired electron; such radicals are extremely reactive, with a very short half-life.oxygen radical a toxic metabolite of oxygen, such as superoxide or singlet oxygen, capable of damaging microorganisms and normal tissues.rad·i·cal (rad'i-kăl), Do not confuse this word with radicle.1. In chemistry, a group of elements or atoms usually passing intact from one compound to another, but usually incapable of prolonged existence in a free state (for example, methyl, CH3); in chemical formulas, a radical is often distinguished by being enclosed in parentheses or brackets. 2. Thorough or extensive; relating or directed to the extirpation of the root or cause of a morbid process; for example, a radical operation. 3. Denoting treatment by extreme, drastic, or innovative, as opposed to conservative, measures. 4. Synonym(s): free radical5. A functional group in a molecule or molecular entity. [L. radix (radic-), root] radical (răd′ĭ-kəl)adj.1. Departing markedly from the usual or customary; extreme or drastic: a radical change in diet.2. Medicine Relating to or being surgery that is extreme or drastic in an effort to eradicate all existing or potential disease: radical hysterectomy.3. Botany a. Of, relating to, or arising from a root: radical hairs.b. Arising from the base of a stem or from a below-ground stem or rhizome: radical leaves.
rad′i·cal·ly adv.rad′i·cal·ness n.rad·i·cal (rad'i-kăl) 1. chemistry A group of elements or atoms usually passing intact from one compound to another, but usually incapable of prolonged existence in a free state (e.g., methyl, CH3); in chemical formulas, a radical is often distinguished by being enclosed in parentheses or brackets. 2. Directed to the extirpation of the root or cause of a morbid process, e.g., a radical operation. 3. Denoting treatment by extreme, drastic, or innovative, as opposed to conservative, measures. 4. Synonym(s): free radical. [L. radix (radic-), root]radical (of plants) arising from the root or crown.rad·i·cal (rad'i-kăl) 1. In chemistry, a group of elements or atoms usually passing intact from one compound to another, but usually incapable of prolonged existence in a free state (e.g., methyl, CH3). 2. Thorough or extensive; relating or directed to the extirpation of the root or cause of a morbid process. 3. Denoting treatment by extreme, drastic, or innovative, as opposed to conservative, measures. [L. radix (radic-), root]FinancialSeegroupRADICAL
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| RADICAL➣RCIED (Remote-Controlled Improvised Explosive Device) Detection Identification & Classification Algorithms (US Air Force) |
radical
Synonyms for radicaladj extremeSynonyms- extreme
- complete
- entire
- sweeping
- violent
- severe
- extensive
- wide-ranging
- excessive
- thorough
- drastic
- rigorous
- far-reaching
- draconian
adj revolutionarySynonyms- revolutionary
- reforming
- extreme
- militant
- progressive
- left-wing
- extremist
- reformist
- fanatical
adj fundamentalSynonyms- fundamental
- natural
- basic
- essential
- native
- constitutional
- organic
- profound
- innate
- deep-seated
- thoroughgoing
- hard-wired
Antonyms- minor
- token
- trivial
- superficial
- insignificant
noun extremistSynonyms- extremist
- revolutionary
- militant
- reformer
- fanatic
- left-winger
- zealot
- revisionist
Antonyms- conservative
- moderate
- reactionary
Synonyms for radicaladj arising from or going to the root or sourceSynonyms- basal
- basic
- foundational
- fundamental
- original
- primary
- underlying
adj holding especially political views that deviate drastically and fundamentally from conventional or traditional beliefsSynonyms- extreme
- extremist
- fanatic
- fanatical
- rabid
- revolutionary
- ultra
- far-out
noun one who holds extreme views or advocates extreme measuresSynonyms- extremist
- fanatic
- revolutionary
- revolutionist
- ultra
- zealot
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