/ Dictionary / Index L lacuna: Meaning and Definition of Find definitions for: la•cu•na Pronunciation: (lu-ky'nu), [key] — pl. -nae -nas. a gap or missing part, as in a manuscript, series, or logical argument; hiatus. one of the numerous minute cavities in the substance of bone, supposed to contain nucleate cells. an air space in the cellular tissue of plants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lacuna (Thesaurus) La Cumbre lacunal Related Content Daily Word Quiz: furtive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language