Pistachio (Pistacia vera), small tree of the cashew family (Anacardiaceae) and its edible seeds. Grown in dry lands in warm or temperate climates. The seed kernels can be eaten fresh or roasted and are commonly used in a variety of desserts, including baklava, halvah, and ice cream. They are also used for yellowish-green colouring in confections. The seeds are high in protein, fat, dietary fibre, and vitamin B6.