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