/ Dictionary / Index P pentagonal dodecahedron: Meaning and Definition of Find definitions for: pentag'onal dodecahe'dron Pronunciation: [key] — Crystall. Crystall. pyritohedron. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pentagon Pentagonese 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