| 释义 |
nor-
nor-pref. An unaltered parent compound: norepinephrine.
[Short for normal.]nor- combining form 1. (Chemistry) indicating that a chemical compound is derived from a specified compound by removal of a group or groups: noradrenaline. 2. (Chemistry) indicating that a chemical compound is a normal isomer of a specified compound [by shortening from normal]nor (nɔr; unstressed nər)
conj. 1. (used in negative phrases, esp. after neither, to introduce the second member in a series, or any subsequent member): Neither he nor I will be there. They won't wait for you, nor for me, nor for anybody. 2. (used to continue the force of a negative, as not, no, never, etc., occurring in a preceding clause): I never saw him again, nor did I regret it. 3. (used after an affirmative clause, or as a continuative, in the sense of and not): They are happy, nor need we worry. 4. Older Use. than. 5. Archaic. (used without a preceding neither, the negative force of which is understood): He nor I was there. 6. Archaic. (used instead of neither as correlative to a following nor): Nor he nor I was there. [1300–50; Middle English, contraction of nother, Old English nōther=ne not + ōther (contraction of ōhwæther) either; compare or1] usage: See neither. NOR (nɔr)
n. a Boolean operator that returns a positive result when both operands are negative. [1955–60] nor- a combining form used in the names of chemical compounds that are the normal or parent forms of the compound denoted by the base words: l-norepinephrine. [short for normal] Nor. 1. North. 2. Northern. 3. Norway. nor. 1. north. 2. northern. nor-
nor-[nȯr] (chemistry) Chemical formula prefix for normal; indicates a parent for another compound to be formed by removal of one or more carbons and associated hydrogens. nor-
nor- a chemical prefix denoting either (a) a compound of normal structure (having an unbranched chain of carbon atoms) that is isomeric with one having a branched chain, or (b) a compound whose chain or ring contains one less methylene (CH2) group than that of its homologue.nor-1. Chemical prefix denoting 1) elimination of one methylene group from a chain, the highest permissible locant being used; 2) contraction of a (steroid) ring by one CH2 unit, the locant being the capital letter identifying the ring. Elimination of two methylene groups is denoted by the prefix dinor-; three groups, by trinor-, for example, norleucine. 2. Chemical prefix denoting "normal," that is, unbranched chain of carbon atoms in aliphatic compounds, as opposed to leucine, a branched chain with the same number of carbon atoms. nor- Chemical prefix denoting: 1. Elimination of one methylene group from a chain, the highest permissible locant being used. 2. Contraction of a (steroid) ring by one CH2 unit, the locant being the capital letter identifying the ring. Elimination of two methylene groups is denoted by the prefix dinor-; three groups, by trinor-. 3. Chemical prefix denoting "normal," i.e., unbranched chain of carbon atoms in aliphatic compounds, as opposed to branched with the same number of carbon atoms; e.g., norleucine, leucine. nor- Chemical prefix denoting: 1. Elimination of one methylene group from a chain, the highest permissible locant being used. 2. Contraction of a (steroid) ring by one CH2 unit. 3. Chemical prefix denoting "normal," i.e., unbranched chain of carbon atoms in aliphatic compounds. FinancialSeeNOR |