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.

Trŭentum, i, n., a town of Picenum, on the river Truentus (now Tronto), Plin. 3, 13, 18, § 110.
Hence, Trŭentīnus, a, um, adj., of or belonging to Truentum, Truentine: Castrum, another name for Truentum, Pompon. ap. Cic. Att. 8, 12, B, 1: turres, Sil. 8, 435.
Plur. subst.: Trŭentī-ni, ōrum, m., the inhabitants of Truentum, the Truentines, Plin. 3, 15, 20, § 116.