| 释义 |
precursor
pre·cur·sor P0514000 (prĭ-kûr′sər, prē′kûr′sər)n.1. One that precedes and indicates, suggests, or announces someone or something to come: Colonial opposition to unfair taxation by the British was a precursor of the Revolution.2. One that precedes another; a forerunner or predecessor: The new principal's precursor was an eminent educator.3. A biochemical substance, such as an intermediate compound in a chain of enzymatic reactions, from which a more stable or definitive product is formed: a precursor of insulin.
[Middle English precursoure, from Old French precurseur, from Latin praecursor, from praecursus, past participle of praecurrere, to run before : prae-, pre- + currere, to run; see kers- in Indo-European roots.]precursor (prɪˈkɜːsə) n1. a person or thing that precedes and shows or announces someone or something to come; harbinger2. a predecessor or forerunner3. (Chemistry) a chemical substance that gives rise to another more important substance[C16: from Latin praecursor one who runs in front, from praecurrere, from prae in front + currere to run]pre•cur•sor (prɪˈkɜr sər, ˈpri kɜr-)
n. 1. a person or thing that precedes, as in a job or a method; predecessor. 2. a person, animal, or thing regarded as a harbinger: The first robin is a precursor of spring. 3. a chemical that is transformed into another compound, as in the course of a chemical reaction, and therefore precedes that compound in the synthetic pathway: Cholesterol is a precursor of testosterone. 4. a cell or tissue that gives rise to a variant, specialized, or more mature form. [1375–1425; late Middle English < Latin] pre•cur′so•ry, adj. precursorAny chemical reactant which takes place at any stage in the production by whatever method of a toxic chemical. This includes any key component of a binary or multicomponent chemical system. See also toxic chemical.Thesaurus| Noun | 1. | precursor - a substance from which another substance is formed (especially by a metabolic reaction)biochemistry - the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistrymaterial, stuff - the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread" | | 2. | precursor - a person who goes before or announces the coming of anotherforerunnerindividual, mortal, person, somebody, someone, soul - a human being; "there was too much for one person to do"predecessor - one who precedes you in time (as in holding a position or office) | | 3. | precursor - something that precedes and indicates the approach of something or someoneharbinger, herald, predecessor, forerunnerindicant, indication - something that serves to indicate or suggest; "an indication of foul play"; "indications of strain"; "symptoms are the prime indicants of disease" |
precursornoun1. forerunner, pioneer, predecessor, forebear, antecedent, originator Real tennis, a precursor of the modern game, originated in the eleventh century.2. herald, usher, messenger, vanguard, forerunner, harbinger The deal should not be seen as a precursor to a merger.precursornoun1. One that indicates or announces someone or something to come:forerunner, foreshadower, harbinger, herald, presager.2. One that precedes, as in time:ancestor, antecedent, forerunner, predecessor, progenitor.TranslationsPräkursorVorläuferprécurseurprédécesseurprecursore
precursor
precursor a chemical substance that gives rise to another more important substance precursor
precursor [pre-ker´ser] something that precedes. In biological processes, a substance from which another, usually more active or mature substance, is formed. In clinical medicine, a sign or symptom that heralds another.pre·cur·sor (prē-kŭr'sŏr), That which precedes another or from which another is derived, applied especially to a physiologically inactive substance that is converted to an active enzyme, vitamin, hormone, etc., or to a chemical substance that is built into a larger structure in the course of synthesizing the latter. [L. praecursor, fr. prae-, pre- + curro, to run] precursor (prĭ-kûr′sər, prē′kûr′sər)n. A biochemical substance, such as an intermediate compound in a chain of enzymatic reactions, from which a more stable or definitive product is formed: a precursor of insulin.pre·cur·sor (prē'kŭrs-ŏr) That which precedes another or from which another is derived, applied especially to a physiologically inactive substance that is converted to an active enzyme, vitamin, or hormone, or to a chemical substance that is built into a larger structure in the course of synthesizing the latter. [L. praecursor, fr. prae-, pre- + curro, to run]precursor a form that precedes another. For example: - (a) a substance that precedes and is involved in the synthesis of a compound, such as any of the intermediates in the synthesis of an AMINO ACID.
- (b) a cell from which other cells develop.
- (c) a molecule that is subjected to modification to provide an active molecule, such as the enzymic cleavage of TRYPSINOGEN to yield TRYPSIN (see ZYMOGEN).
pre·cur·sor (prē'kŭrs-ŏr) That which precedes another or from which another is derived. [L. praecursor, fr. prae-, pre- + curro, to run]precursor
Synonyms for precursornoun forerunnerSynonyms- forerunner
- pioneer
- predecessor
- forebear
- antecedent
- originator
noun heraldSynonyms- herald
- usher
- messenger
- vanguard
- forerunner
- harbinger
Synonyms for precursornoun one that indicates or announces someone or something to comeSynonyms- forerunner
- foreshadower
- harbinger
- herald
- presager
noun one that precedes, as in timeSynonyms- ancestor
- antecedent
- forerunner
- predecessor
- progenitor
Synonyms for precursornoun a substance from which another substance is formed (especially by a metabolic reaction)Related Words- biochemistry
- material
- stuff
noun a person who goes before or announces the coming of anotherSynonymsRelated Words- individual
- mortal
- person
- somebody
- someone
- soul
- predecessor
noun something that precedes and indicates the approach of something or someoneSynonyms- harbinger
- herald
- predecessor
- forerunner
Related Words |