/ Dictionary / Index L lemniscus: Meaning and Definition of Find definitions for: lem•nis•cus Pronunciation: (lem-nis'kus), [key] — pl. -nis•ci a band of fibers, esp. of white nerve fibers in the brain. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lemniscus (Thesaurus) lemniscate Lemnitzer Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language