The Collaborative International Dictionary of English v.0.48:

Vare \Vare\, n. (Zool.)
   A weasel. [Prov. Eng.]
   [1913 Webster]

   Vare widgeon (Zool.), a female or young male of the smew; a
      weasel duck; -- so called from the resemblance of the head
      to that of a vare, or weasel. [Prov. Eng.]
      [1913 Webster]