/ Dictionary / Index H horse clam: Meaning and Definition of Find definitions for: horse' clam" Pronunciation: [key] gaper. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. horse chestnut horsecloth Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language