The Collaborative International Dictionary of English v.0.48:

Spade \Spade\, n. [Cf. Spay, n.]
   1. (Zool.) A hart or stag three years old. [Written also
      spaid, spayade.]
      [1913 Webster]

   2. [Cf. L. spado.] A castrated man or beast.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spayad \Spay"ad\, Spayade \Spay"ade\, n. (Zool.)
   A spay.
   [1913 Webster]