/ Dictionary / Index P pinnula: Meaning and Definition of Find definitions for: pin•nu•la Pronunciation: (pin'yu-lu), [key] — pl. -lae a pinnule. a barb of a feather. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pinniped pinnulate 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