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.

Antōnīnus, i, m. [Antonius], Antonine, the name of several Roman emperors; among whom the most distinguished were Antoninus Pius and M. Aurelius Antoninus Philosophus, Inscr. Orell. 834 sq.; 856 sq.
Hence, Antōnīnĭānus, a, um, adj., of or belonging to Antonine, Eutr. 8, 10; Lampr. Elag. 24 al.