Lewis & Short

Ăsĭnĭus, a, um, adj., name of a Roman gens; the most celebrated was Asinius Pollio, a friend of Augustus, founder of the first library in Rome, and author of a history, now lost, of the civil war between Cœsar and Pompey, Cic. Fam. 10, 31 sq. Manut.; Vell. 2, 125; Hor. C 2, 1; Verg. E. 4; Tac. A. 4, 34; Suet. Caes. 30; id. Gram. 10; cf. Bähr, Lit. Gesch. § 192; Weich. Poët. Lat. pp. 155, 293, 327, 395; Teuffel, Röm. Lit. § 218.
Hence, Ăsĭnĭānus, a, um, adj., pertaining to the gens Asinia, or to an Asinius: crimen, Cic. Clu. 13.