/ Dictionary / Index L lacunal: Meaning and Definition of Find definitions for: la•cu•nal Pronunciation: (lu-kyn'l), [key] — adj. of or pertaining to a lacuna. having lacunae. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lacuna lacunar Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language