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horse chestnut

noun
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.
Origin
1590-1600
1590-1600; translation of Neo-Latin castanea equīna; so named from its use in treating respiratory diseases of horses
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for horse chestnut

horse chestnut

noun
1.
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
2.
Also called conker. the nut of this tree
Word Origin
C16: so called from its having been used in the treatment of respiratory disease in horses
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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