/ Dictionary / Index B bipinnate: Meaning and Definition of Find definitions for: bi•pin•nate Pronunciation: (bī-pin'āt), [key] — adj. Bot. pinnate, as a leaf, with the divisions also pinnate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bipinnate (Thesaurus) bipinnaria biplane Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language