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.

Ubĭi, ōrum, m., a Germanic people, who in Cœsar’s time occupied the territory on the east bank of the Rhine, near the mod. Cologne, but were transferred to the left bank of the Rhine by Agrippa, B. C. 39, Caes. B. G. 1, 54; 4, 3; 4, 16; 6, 9; Tac. G. 28; id. A. 1, 31; 1, 36: oppidum Ubiorum, their chief city, id. ib. 1, 39; 1, 57.
Hence, Ubĭus, a, um, adj., Ubian, of the Ubii: mulier Ubia, Tac. H. 5, 22.