Pīso, ōnis, m.,
I a Roman surname in the gens Calpurnia; v. Calpurnius, Cic. Font. 13, 39; Juv. 5, 109.—Hence,
II Pīsōnĭ-ānus , a, um, adj., of or belonging to a Piso , Pisonian : Pisoniana conjuratio, Suet. Ner. 36: Pisoniano vitio, cum loqui nesciret, tacere non potuit (with reference to Cic. Pis. 1, 1, where Cicero charges Piso with lack of eloquence), Hier. Ep. 69, 2.