/ Dictionary / Index P pentagonoid: Meaning and Definition of Find definitions for: pen•tag•o•noid Pronunciation: (pen-tag'u-noid"), [key] — adj. like a pentagon in shape. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pentagonese pentagram Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language