conker

[ kong-ker, kawng- ]
/ ˈkɒŋ kər, ˈkɔŋ- /

noun British Informal.

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.

Origin of conker

1840–50; probably orig. conquer; compare conquering a game played with snail shells (the name of the game presumably later transferred to the playing pieces)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for conker

conker

/ (ˈkɒŋkə) /

noun

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