Lewis & Short

Mŏsella, ae, m. and f., a river of Belgic Gaul, now the Moselle, Tac. A. 13, 53; id. H. 4, 71; 77: largus Mosella, Aus. de Clar. Urb. 4: placida Mosella, id. Idyll. 10, 73.
Also called Mŏsŭla, ae, f., Flor. 3, 10, 14.
Hence, Mŏsellēus, a, um, adj., of or belonging to the Moselle: ortus, Symm. Ep. 1, 8.