The Collaborative International Dictionary of English v.0.48:

Catfish \Cat"fish`\, n. (Zool.)
   A name given in the United States to various species of
   siluroid fishes; as, the yellow cat (Amiurus natalis); the
   bind cat (Gronias nigrilabrus); the mud cat (Pilodictic
   oilwaris), the stone cat (Noturus flavus); the sea cat
   (Arius felis), etc. This name is also sometimes applied to
   the wolf fish. See Bullhrad.
   [1913 Webster]