Breadcrumb Home > Dictionary > Index S shell jacket: Meaning and Definition of Find definitions for: shell' jack"et Pronunciation: [key] a close-fitting, semiformal jacket, with a short back, worn in the tropics in place of a tuxedo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. shell game shell parakeet ✖ Related Content Daily Word Quiz: triumphalism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language