The Collaborative International Dictionary of English v.0.48:

Chayote \Cha"yo"te\
   1. a tropical West Indian vine (Sechium edule) of the gourd
      family, which bears small white flowers and produces an
      edible fruit.
      [PJC]

   2. the edible fruit of the chayote[1] vine, having a pear
      shape with a furrowed skin, and usually green or white. It
      is also called choyote, christophene, mirliton, and
      vegetable pear
      [PJC]