/ Dictionary / Index M Mellotron: Meaning and Definition of Find definitions for: Mel•lo•tron Pronunciation: (mel'u-tron"), [key] — Trademark. Trademark. a brand of synthesizer that simulates the sound of other instruments by using tapes of recorded sounds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mellophone mellow Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language