- precursor - a substance from which another substance is formed (especially by a metabolic reaction)
--1 is a kind of substance, matter
- precursor, forerunner - a person who goes before or announces the coming of another
--2 is a kind of person, individual, someone, somebody, mortal, human, soul
--2 has particulars: predecessor- harbinger, forerunner, herald, precursor - an indication of the approach of something or someone
--3 is a kind of indication, indicant
- precursor, forerunner - a person who goes before or announces the coming of another