horse chestnut
noun
1- a deciduous tree with large leaves of five leaflets, conspicuous sticky winter buds, and upright conical clusters of white, pink, or red flowers. It bears nuts (conkers) enclosed in a fleshy case.七叶树属植物, 马栗。
1.1
- Genus Aesculus, family Hippocastanaceae: several species, in particular A. hippocastanum, native east of the Balkans and widely planted.七叶树属, 七叶树科：数种, 尤指欧洲七叶树（拉丁名A. hippocastanum）, 原产地在巴尔干半岛东部, 广为种植。
词源
late 16th cent.: translating (now obsolete) botanical Latin Castanea equina; its fruit is said to have been an Eastern remedy for chest diseases in horses.