Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. strĭga, ae, f. [stringo].
2. strīga, ae, f. [1. strix], a woman that brings harm to children, a hag, witch, Petr. 63; cf. Fest. s. v. strigem, p. 314 Müll.: striga, γυνὴ φαρμακίς, Gloss. Philox.