1. (Bot.) The edible nut of a forest tree (Castanea vesce) of Europe and America. Commonly two or more of the nuts grow in a prickly bur. 2. The tree itself, or its light, coarse-grained timber, used for ornamental work, furniture, etc. 3. A bright brown color, like that of the nut. 4. The horse chestnut (often so used in England). 5. One of...