Open English Wordnet
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Nouns
(n)
precursor
a substance from which another substance is formed (especially by a metabolic reaction)
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(n)
precursor
,
forerunner
a person who goes before or announces the coming of another
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(n)
harbinger
,
forerunner
,
predecessor
,
herald
,
precursor
something that precedes and indicates the approach of something or someone
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