Breadcrumb Home > Dictionary > Index H hornstone: Meaning and Definition of Find definitions for: horn•stone Pronunciation: (hôrn'stōn"), [key] — n. Archaic. a variety of quartz resembling flint. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hornstone (Thesaurus) horn-spread hornswoggle ✖ Related Content Daily Word Quiz: acronym Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language