n. | 1. | One who, or that which, precedes an event, and indicates its approach; a forerunner; a harbinger. |
Noun | 1. | precursor - a substance from which another substance is formed (especially by a metabolic reaction) |
2. | precursor - a person who goes before or announces the coming of another Synonyms: forerunner | |
3. | precursor - an indication of the approach of something or someone |