a tree, Aesculus hippocastanum, native to the Old World, having digitate leaves and upright clusters of white flowers.
the shiny, brown, nutlike seed of this tree or of other trees of the genus Aesculus.
any of several trees of the genus Aesculus, esp the Eurasian A. hippocastanum, having palmate leaves, erect clusters of white, pink, or red flowers, and brown shiny inedible nuts enclosed in a spiky bur: family Hippocastanaceae
Also called conker. the nut of this tree

1590s, from horse + chestnut. A tree probably native to Asia, introduced in England c.1550; the name also was extended to similar North American species such as the buckeye. Said to have been so called because it was food for horses. The nut resembles that of the edible chestnut but is bitter to the taste.


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