Medical Dictionary
precursor
noun pre·cur·sor \pri-ˈkər-sər, ˈprē-ˌ\
Medical Definition of PRECURSOR
1
: one that precedes and indicates the onset of another <angina may be the precursor of a second infarction>
2
: a substance, cell, or cellular component from which another substance, cell, or cellular component is formed especially by natural processes
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