Dictionary entry

Leuco-

Webster's Dictionary 1913

{ Leu″co– (lū″kō̍–), Leuc– (lūk–). } [Gr. λευκόσ white.] A combining form signifying white, colorless; specif. (Chem.), denoting an extensive series of colorless organic compounds, obtained by reduction from certain other colored compounds; as, leucaniline, leucaurin, etc.