Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† scĭădeus, ĕi, m., and scĭaena, ae, f., = σκιαδεύς and σκίαινα, the male and female of a sea-fish; perh. a kind of grayling or ombre: Salmo thymallus, Linn.; Plin. 32, 11, 53, § 151.