/ Dictionary / Index H horn fly: Meaning and Definition of Find definitions for: horn' fly" Pronunciation: [key] a small bloodsucking fly, Haematobia irritans, that is a pest, esp. of cattle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hornfels Hornie Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language