The Collaborative International Dictionary of English v.0.48:

Balaenoidea \Bal`[ae]*noi"de*a\, n. [NL., from L. balaena whale
   + -oid.] (Zool.)
   A division of the Cetacea, including the right whale and all
   other whales having the mouth fringed with baleen. See
   Baleen.
   [1913 Webster]