/ Dictionary / Index H hornblende: Meaning and Definition of Find definitions for: horn•blende Pronunciation: (hôrn'blend"), [key] — n. a dark-green to black mineral of the amphibole group, calcium magnesium iron and hydroxyl aluminosilicate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hornblende (Thesaurus) hornbill hornblende schist Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language