/ Dictionary / Index P pentahedron: Meaning and Definition of Find definitions for: pen•ta•he•dron Pronunciation: (pen"tu-hē'drun), [key] — pl. -drons, -dra a solid figure having five faces. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pentahedron (Thesaurus) pentagram pentahydrate 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