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.

Singăra, ōrum, n., a city of Mesopotamia, the capital of the Arabes Prætavi, Plin. 5, 24, 21, § 86.
Hence, adj.: Singărē-nus, a, um, of or belonging to Singara: congressiones, Sext. Ruf. Brev. 27.