The Collaborative International Dictionary of English v.0.48:

Roussette \Rous*sette"\, n. [F.; -- so called in allusion to the
   color. See Russet.]
   1. (Zool.) A fruit bat, especially the large species
      (Pieropus vulgaris) inhabiting the islands of the Indian
      ocean. It measures about a yard across the expanded wings.
      [1913 Webster]

   2. (Zool.) Any small shark of the genus Scyllium; -- called
      also dogfish. See Dogfish.
      [1913 Webster]