[1] : The Collaborative International Dictionary of English v.0.48

right whale \right" whale`\ zool.
   a the bowhead, arctic, or greenland whale balaena
       mysticetus, from whose mouth the best whalebone is
       obtained.
   b any other whale that produces valuable whalebone, as the
       atlantic, or biscay, right whale balaena cisarctica,
       and the pacific right whale balaena sieboldii; a bone
       whale.
       1913 webster

   pygmy right whale zool., a small new zealand whale
      neobalaena marginata which is only about sixteen feet
      long. it produces short, but very elastic and tough,
      whalebone.
      1913 webster
see also:
balaena mysticetus balaena cisarctica balaena sieboldii pygmy right whale neobalaena marginata 

[2] : WordNet (r) 2.0

right whale
     n : large arctic whalebone whale; allegedly the `right' whale to
         hunt because of its valuable whalebone and oil

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