/ Dictionary / Index A apterous: Meaning and Definition of Find definitions for: ap•ter•ous Pronunciation: (ap'tur-us), [key] — adj. wingless, as some insects. without membranous expansions, as a stem. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: apterous (Thesaurus) apterium apterygial Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language