/ Dictionary / Index L lacrimal sac: Meaning and Definition of Find definitions for: lac'rimal sac" Pronunciation: [key] — Anat. Anat. the dilated upper portion of the nasolacrimal duct that receives tears from the lacrimal ducts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lacrimal gland lacrimation Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language