/ Dictionary / Index M mellophone: Meaning and Definition of Find definitions for: mel•lo•phone Pronunciation: (mel'u-fōn"), [key] — n. a marching or military band brass instrument similar in appearance and range to the French horn but slightly smaller and simpler to play. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mellon Mellotron Related Content Daily Word Quiz: crockery Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language