The Collaborative International Dictionary of English v.0.48:

Sea raven \Sea" ra"ven\ (Zool.)
      (a) An American cottoid fish (Hemitripterus Americanus)
          allied to the sculpins, found on the northern Atlantic
          coasts.
      (b) The cormorant.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Raven \Ra"ven\ (r[=a]"v'n), n. [AS. hr[ae]fn; akin to D. raaf,
   G. rabe, OHG. hraban, Icel. hrafn, Dan. ravn, and perhaps to
   L. corvus, Gr. ko`rax. [root]19.] (Zool.)
   A large black passerine bird (Corvus corax), similar to the
   crow, but larger, and has a harsh, loud call. It is native of
   the northern parts of Europe, Asia and America, and is noted
   for its sagacity.
   [1913 Webster]

   Sea raven (Zool.), the cormorant.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sea raven
    n 1: large sculpin of western Atlantic; inflates itself when
         caught [syn: sea raven, Hemitripterus americanus]