Chestnut (noun)

1. A tree that produces large edible nuts enclosed in a prickly bur.
2. The large, usually shiny, brown nut of the chestnut tree.

Origin:

From old french word "chestin" and latin word "castanea".

Examples:

1. The chestnut tree is a popular ornamental tree in Europe.
2. I roasted some chestnuts over an open fire.
3. The chestnut horse had a dark brown coat.
4. The chestnut is a popular ingredient in many Mediterranean dishes.
5. Chestnut trees have been affected by a fungus, which has caused a decline in chestnut production.