From The Collaborative International Dictionary of English v.0.48 :
Pussy \Pussy\, n. [Dim. of puss.]
1. A pet name for a cat; also, an endearing name for a girl.
[1913 Webster]
2. A catkin of the pussy willow.
[1913 Webster]
3. The game of tipcat; -- also called pussy cat.
[1913 Webster]
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.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
Salix discolor
n 1: small willow of eastern North America having greyish leaves
and silky catkins that come before the leaves [syn: pussy
willow, Salix discolor]