Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Crătaeis, ĭdis, f., = Κραταιίς, the mother of Scylla, Ov. M. 13, 749; Verg. Cir. 65; cf. Plin. 3, 5, 10, § 73.