/ Dictionary / Index A althorn: Meaning and Definition of Find definitions for: alt•horn Pronunciation: (alt'hôrn"), [key] — n. a valved brass musical instrument, varying in shape, that is the alto member of the cornet family. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. altho although Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language