I.a Roman surname; cf.: “aures homini tantum immobiles: ab iis Flaccorum cognomina,” Plin. 11, 37, 50, § 136; esp. freq. in the gens Valeria, Cornelia, and Horatia; “e. g. si quid in Flacco viri est, i. e. in Q. Horatio,” Hor. Epod. 15, 12.—
II. Deriv.: Flaccĭā-nus , a, um, adj., of or belonging to a Flaccus, Flaccian: “area,” Val. Max. 6, 3, 1.