/ Dictionary / Index H hornfels: Meaning and Definition of Find definitions for: horn•fels Pronunciation: (hôrn'felz), [key] — n. a dark, fine-grained metamorphic rock, the result of recrystallization of siliceous or argillaceous sediments by contact metamorphism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hornfels (Thesaurus) Horney horn fly Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language