Word Study
leuc-
CIDE DICTIONARY
leuc-, pref.
Same as Leuco-. [1913 Webster]
leuc-, 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]
For further exploring for "leuc-" in Webster Dictionary Online