Sperm oil

from WordNet (r) 3.0 (2006)

sperm oil
    n 1: an animal oil found in the blubber of the sperm whale

from The Collaborative International Dictionary of English v.0.48

Sperm \Sperm\, n.[Contr. fr. spermaceti.]
   Spermaceti.
   [1913 Webster]

   {Sperm oil}, a fatty oil found as a liquid, with spermaceti,
      in the head cavities of the sperm whale.

   {Sperm whale}. (Zool.) See in the Vocabulary.
      [1913 Webster]