Pronunciation: (pri-kûr'sur, prē'kûr-),[key] —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.