Source : Webster's Revised Unabridged Dictionary (1913)

Pussy \Pussy\, n. [Dim. of puss.]
   1. A pet name for a cat; also, an endearing name for a girl.

   2. A catkin of the pussy willow.

   3. The game of tipcat; -- also called {pussy cat}.

   {Pussy willow} (Bot.), any kind of willow having large
      cylindrical catkins clothed with long glossy hairs,
      especially the American {Salix discolor}; -- called also
      {glaucous willow}, and {swamp willow}.

Source : WordNet®

Salix discolor
     n : small willow of eastern North America having grayish leaves
         and silky catkins that come before the leaves [syn: {pussy
         willow}]