Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Chŏātrae (Cŏātr-; al. Cŏastr-), ārum, m., a people of Lake Mœotis, Plin. 6, 7, 7, § 19; Luc. 3, 246; Val. Fl. 6, 151.