/ Dictionary / Index M monoplane: Meaning and Definition of Find definitions for: mon•o•plane Pronunciation: (mon'u-plān"), [key] — n. an airplane with one main sustaining surface or one set of wings. a planing craft the bottom of which is in an unbroken fore-and-aft line. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: monoplane (Thesaurus) Monophysite monoplegia Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language