| 单词 | precursor |
| 释义 | precursor /pri kerr"seuhr, pree"kerr-/, n. 1. a person or thing that precedes, as in a job, a method, etc.; predecessor. 2. a person, animal, or thing that goes before and indicates the approach of someone or something else; harbinger: The first robin is a precursor of spring. 3. Chem. , Biochem. 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. Biol. a cell or tissue that gives rise to a variant, specialized, or more mature form. [1375-1425; late ME < L praecursor forerunner. See PRE-, CURSOR] Syn. 1. forerunner. 2. herald. |
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