/ Dictionary / Index I incisor: Meaning and Definition of Find definitions for: in•ci•sor Pronunciation: (in-sī'zur), [key] — n. Dentistry. any of the four anterior teeth in each jaw, used for cutting and gnawing. See illus. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: incisor (Thesaurus) incisive incisory Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language