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.-the tree itself, or its light, coarse-grained timber, used for ornamental work, furniture, etc.-a bright brown color, like that of the nut.-the horse chestnut (often so used in england).-one of the round, or oval, horny plates on the inner sides of the legs of the horse, and allied animals.-an old joke or story.-of the color of a chestnut; of a reddish brown color; as, chestnut curls.