Definition of chestnut

• n. - The edible nut of a forest tree (Castanea vesca) of Europe and America. Commonly two or more of the nuts grow in a prickly bur.
• n. - The tree itself, or its light, coarse-grained timber, used for ornamental work, furniture, etc.
• n. - A bright brown color, like that of the nut.
• n. - The horse chestnut (often so used in England).
• n. - One of the round, or oval, horny plates on the inner sides of the legs of the horse, and allied animals.
• n. - An old joke or story.
• a. - Of the color of a chestnut; of a reddish brown color; as, chestnut curls.