| 1. | a tree, Aesculus hippocastanum, native to the Old World, having digitate leaves and upright clusters of white flowers. |
| 2. | the shiny, brown, nutlike seed of this tree or of other trees of the genus Aesculus. |
horse chestnut  (click for larger image in new window) n.
[Perhaps from a former use to cure cough in horses.] |