The Collaborative International Dictionary of English v.0.48:

Sorel \Sor"el\, n. [A diminutive. See Sore reddish brown.]
   1. (Zool.) A young buck in the third year. See the Note under
      Buck. --Shak.
      [1913 Webster]

   2. A yellowish or reddish brown color; sorrel.
      [1913 Webster]