pistachio nut

noun pl. pistachios

1. a small tree (Pistacia vera) of the cashew family
2. its edible, greenish seed
   in full pistachio nut
3. the flavor of this nut
4. a light yellow-green color

Origin: It pistacchio < L pistacium < Gr pistakion < pistakē, pistachio tree < OPers pistah