/ Dictionary / Index L leuc-: Meaning and Definition of Find definitions for: leuc- Pronunciation: [key] var. ofbefore a vowel: leucemia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. leu leucaena Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language