combining form
or leuco- also leuk- or leuko-
Etymology: New Latin, from Greek leuk-, leuko- white, from leukos — more at light
1. : white : colorless : weakly colored
leuc augite
leuco plast
leuko cyte
— often in names of chemical compounds derived from (as by reduction) or related to a dye or other colored compound
leuc aurin
leuco methylene blue
2. : leukocyte
leuko penia
3. : white matter of the brain
leuco tomy