/ Dictionary / Index H hornwort: Meaning and Definition of Find definitions for: horn•wort Pronunciation: (hôrn'wûrt", -wôrt"), [key] — n. any aquatic plant of the genus Ceratophyllum, found in ponds and slow streams. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hornwort (Thesaurus) hornworm horny Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language