/ Dictionary / Index B biplane: Meaning and Definition of Find definitions for: bi•plane Pronunciation: (bī'plān"), [key] — n. an airplane with two sets of wings, one above and usually slightly forward of the other. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: biplane (Thesaurus) bipinnate bipod Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language