/ Dictionary / Index P pentangular: Meaning and Definition of Find definitions for: pen•tan•gu•lar Pronunciation: (pen-tang'gyu-lur), [key] — adj. having five angles and five sides; pentagonal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pentangular (Thesaurus) pentangle pentaploid Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language