/ Dictionary / Index P parallelepiped: Meaning and Definition of Find definitions for: par•al•lel•e•pi•ped Pronunciation: (par"u-lel"u-pī'pid, -pip'id), [key] — n. a prism with six faces, all parallelograms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: parallelepiped (Thesaurus) parallel cousin marriage parallel evolution Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language