'Leuco-' definitions:

Definition of 'Leuco-'

From: GCIDE

Leuco- \Leu"co-\ (l[=u]"k[-o]-), Leuc- \Leuc-\ (l[=u]k-). pref. [Gr. leyko`s 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. [1913 Webster]