Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Limnātis, ĭdis, f., = Λιμνᾶτις (that lives in marshes), a surname of Diana: templum Dianae Limnatidis, Tac. A. 4, 43 init. (Ms. Flor. Liminatidis).