The Collaborative International Dictionary of English v.0.48:

Cottoid \Cot"toid\ (k?t"toid), a. [NL. cottus sculpin + -oid.]
   (Zool.)
   Like a fish of the genus Cottus. -- n. A fish belonging to,
   or resembling, the genus Cottus. See Sculpin.
   [1913 Webster]