/ Dictionary / Index L lateral fissure: Meaning and Definition of Find definitions for: lat'eral fis'sure Pronunciation: [key] — Anat. Anat. the fissure separating the frontal, temporal, and parietal lobes of the cerebrum. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lateral chain laterality Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language