/ Dictionary / Index L lacrimal bone: Meaning and Definition of Find definitions for: lac'rimal bone" Pronunciation: [key] — Anat. Anat. a small, thin, membrane bone forming the front part of the inner wall of each orbit. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lacrimal lacrimal duct Related Content Daily Word Quiz: inane Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language