Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† părēas or părīas, ae, m., = παρείας, a kind of snake, Luc. 9, 721; cf.: pareas serpens, qui semper in caudā ambulat et sulcum facere videtur, Isid. Orig. 12, 4.