/kong"keuhr, kawng"-/ , n. Brit. Informal.
1. a horse chestnut.
2. the hollowed-out shell of a horse chestnut.
3. conkers , a game in which a child swings a horse chestnut on a string in an attempt to break that of another player.
[ 1840-50; prob. orig. CONQUER; cf. conquering a game played with snail shells (the name of the game presumably later transferred to the playing pieces) ]