/ Dictionary / Index C cranium: Meaning and Definition of Find definitions for: cra•ni•um Pronunciation: (krā'nē-um), [key] — pl. -ni•ums, -ni•a the skull of a vertebrate. the part of the skull that encloses the brain. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cranium (Thesaurus) craniotomy crank Related Content Daily Word Quiz: quandary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language