Etymology
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conker (n.)

"snail shell" (said to date from 1847), also "horse chestnut" (said to date from 1886), both said to be from children's game of conkers (q.v.).

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Definitions of conker

conker (n.)
the inedible nutlike seed of the horse chestnut;
Synonyms: buckeye / horse chestnut
From wordnet.princeton.edu