The Collaborative International Dictionary of English v.0.48:

Silurus \Si*lu"rus\, n. [L. See Silure.] (Zool.)
   A genus of large malacopterygious fishes of the order
   Siluroidei. They inhabit the inland waters of Europe and
   Asia.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Silurus
    n 1: type genus of the Siluridae: catfishes [syn: Silurus,
         genus Silurus]