precursor

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pre·cur·sor / ˈprēˌkərsər; priˈkər-/ • n. a person or thing that comes before another of the same kind; a forerunner: a three-stringed precursor of the violin| [as adj.] precursor cells. ∎  Biochem. a substance from which another is formed, esp. by metabolic reaction: pepsinogen is the inactive precursor of pepsin.

precursor

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precursor XVI. — L. præcursor, f. præcurrere, f. præ- PRE- + currere run; see COURSE, -OR1.

precursor

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precursor (pri-ker-ser) n. a substance from which another, usually more biologically active, substance is formed. For example, trypsinogen is the precursor of the enzyme trypsin.