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WordNet-Online
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Noun precursor has 3 senses
- 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
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