horse chestnut
noun
1
: a large tree (Aesculus hippocastanum of the family Sapindaceae, the soapberry family) of southeastern Europe that has palmate leaves and erect conical clusters of showy flowers and is widely cultivated as an ornamental and shade tree and naturalized as an escape
also
: buckeye
2
: the large glossy brown seed of a horse chestnut
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Merriam-Webster unabridged
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