Parthĕnon: ōnis, m., = Παρθενών,I the celebrated temple of Athene on the Acropolis of Athens, the Parthenon, Plin. 34, 8, 19, § 54.—Hence,II Transf., a portico in the villa of Pomponius Atticus, Cic. Att. 13, 40, 1.