Etymology
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pachinko (n.)

1953, from Japanese, "pinball machine," also "slingshot, handgun," from pachin, of echoic origin, + diminutive suffix -ko.

updated on December 30, 2012

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Definitions of pachinko from WordNet

pachinko (n.)
a Japanese pinball game played on a vertical board;
From wordnet.princeton.edu, not affiliated with etymonline.