/ Dictionary / Index S sesquiplane: Meaning and Definition of Find definitions for: ses•qui•plane Pronunciation: (ses'kwi-plān"), [key] — n. Aeron. a biplane having one wing with not more than half the surface area of the other wing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sesquipedalian sesquiterpene Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language