precursor

Noun
  1. A substance from which another substance is formed (especially by a metabolic reaction) (synset 114607246)
    referred to in: biochemistry - the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry
    is a type of: material, stuff - the tangible substance that goes into the makeup of a physical object
  2. A person who goes before or announces the coming of another (synset 109650305)
    is a type of: individual, mortal, person, somebody, someone, soul - a human being
    subtypes: predecessor - one who precedes you in time (as in holding a position or office)
    same as: forerunner
  3. Something that precedes and indicates the approach of something or someone (synset 106815429)
    is a type of: indicant, indication - something that serves to indicate or suggest
    same as: forerunner, harbinger, herald, predecessor

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