Pistachio (noun)

1. A small, edible, green seed encased in a hard, beige shell that grows on trees in the Pistacia genus.
2. A tree of the Pistacia genus, which produces the aforementioned seeds.

Origin:

The word pistachio comes from the latin word pistacium and the greek word pistakion, which are derived from the persian word pistah, which means "a nut".

Examples:

1. She ate a handful of salted pistachios as a snack.
2. I added chopped pistachios to my ice cream sundae for some crunch.
3. The pistachio trees were in full bloom, and the orchard looked beautiful.
4. The pistachio is a popular ingredient in Mediterranean and Middle Eastern cuisine.
5. The farmer was proud of his crop of pistachios, which had a high yield this year.