14 letters · 21 points in Scrabble
noun a prism whose bases are parallelograms
originFrom Latin parallēlepipedum, from Ancient Greek παραλληλεπίπεδος (parallēlepípedos, “with parallel surfaces”), from παράλληλος (parállēlos, “parallel”) + ἐπίπεδος (epípedos, “plane”).
Etymology from Wiktionary, CC BY-SA 3.0