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.

Cerretāni, ōrum, m., an Iberian people of Hispania Tarraconensis, among the Pyrenees, Plin. 3, 3, 4, § 22; Sil. 3, 357.
Hence, Cerretānus, a, um, of the Cerretani: perna, Mart. 13, 54, 1.