a horse chestnut.
the hollowed-out shell of a horse chestnut.
conkers, a game in which a child swings a horse chestnut on a string in an attempt to break that of another player.
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How to use conker in a sentence
British Dictionary definitions for conker
an informal name for horse chestnut (def. 2)
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