13 letters · 25 points in Scrabble
adjective marked by columniation having free columns in porticoes either at both ends or at both sides of a structure
originFrom Latin amphiprostȳlos, from Ancient Greek ἀμφι- (amphi-) + πρόστῡλος (próstūlos, “having pillars”).
Etymology from Wiktionary, CC BY-SA 3.0