The Collaborative International Dictionary of English v.0.48:

Pygopod \Py"go*pod\, n. [Gr. pygh` rump + -pod.]
   [1913 Webster]
   1. (Zool.) One of the Pygopodes.
      [1913 Webster]

   2. (Zool.) Any species of serpentiform lizards of the family
      Pygopodid[ae], which have rudimentary hind legs near the
      anal cleft, but lack fore legs.
      [1913 Webster]