Sheat·fish n.  Zool. A European siluroid fish (Silurus glanis) allied to the cat-fishes. It is the largest fresh-water fish of Europe, sometimes becoming six feet or more in length. See Siluroid.

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 Si·lu·roid n.  Zool. Belonging to the Siluroidei, or Nematognathi, an order of fishes including numerous species, among which are the American catfishes and numerous allied fresh-water species of the Old World, as the sheatfish (Silurus glanis) of Europe. -- n. A siluroid fish.

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 Silurus glanis
      n : large elongated catfish of central and eastern Europe [syn:
          European catfish, sheatfish]