/ Dictionary / Index H half shell: Meaning and Definition of Find definitions for: half' shell" Pronunciation: [key] either of the halves of a double-shelled creature, as of an oyster, clam, or other bivalve mollusk. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. half-share halfsies Related Content Daily Word Quiz: tranquil Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language