/ Dictionary / Index P pinna: Meaning and Definition of Find definitions for: pin•na Pronunciation: (pin'u), [key] — pl. pin•nae pin•nas. one of the primary divisions of a pinnate leaf. a feather, wing, or winglike part. a fin or flipper. auricle (def. 1a). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pinna (Thesaurus) pin money pinnace Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language