finback

from WordNet (r) 3.0 (2006)

finback
    n 1: large flat-headed whalebone whale having deep furrows along
         the throat; of Atlantic and Pacific [syn: {finback},
         {finback whale}, {fin whale}, {common rorqual},
         {Balaenoptera physalus}]

from The Collaborative International Dictionary of English v.0.48

Finback \Fin"back`\, n. (Zool.)
   Any whale of the genera {Sibbaldius}, {Bal[ae]noptera}, and
   allied genera, of the family {Bal[ae]nopterid[ae]},
   characterized by a prominent fin on the back. The common
   finbacks of the New England coast are {Sibbaldius
   tectirostris} and {S. tuberosus}.
   [1913 Webster]