Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† sĭlūrus, i, m., = σίλουρος, a riverfish, prob. the sheat-fish: Silurus glanis, Linn.; Plin. 9, 15, 17, § 44; 32, 9, 33, § 104; Lucil. ap. Varr. L. L. 7, § 47 Müll; Juv. 4, 33; 14, 132; Aus. Mos. 135.