/ Dictionary / Index L Leu enkephalin: Meaning and Definition of Find definitions for: Leu' enkeph'alin Pronunciation: (l), [key] — (sometimes l.c.) See under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. leud leuk- Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language