/ Dictionary / Index S sulcus: Meaning and Definition of Find definitions for: sul•cus Pronunciation: (sul'kus), [key] — pl. -ci a furrow or groove. a groove or fissure, esp. a fissure between two convolutions of the brain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sulcus (Thesaurus) sulcate Suleiman I Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language