The Collaborative International Dictionary of English v.0.48:

Pixy \Pix"y\, Pixie \Pix"ie\, n.; pl. Pixies. [For Pucksy,
   from Puck.]
   1. An old English name for a fairy; an elf. [Written also
      picksy.]
      [1913 Webster]

   2. (Bot.) A low creeping evergreen plant (Pyxidanthera
      barbulata), with mosslike leaves and little white
      blossoms, found in New Jersey and southward, where it
      flowers in earliest spring.
      [1913 Webster]

   Pixy ring, a fairy ring or circle. [Prov. Eng.]

   Pixy stool (Bot.), a toadstool or mushroom. [Prov. Eng.]
      [1913 Webster]