Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

2. Tīro, ōnis, m., a Roman proper name. So esp., M. Tullius Tiro, the learned freedman of Cicero, Cic. Fam. 16, 10; id. Att. 6, 7, 2; 9, 17, 2 (to him are addressed the letters id. Fam. 16, 3-10; 16, 12-15); Gell. 7, 3, 8; 13, 9, 1 sq.
Hence, Tīrōnĭ-ānus, a, um, adj., of or belonging to Tiro: liber, Gell. 13, 20, 16: Tironiana cura, id. 1, 7, 1.

Tīrōnĭānus, a, um, v. 2. Tiro.