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.22

or twen·ty-two

[twen-tee-too, twuhn-]
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noun, plural .22s, .22's.
  1. a rifle or pistol using a cartridge .22 inch in diameter and of varying length.
  2. the cartridge itself.

Origin of .22

First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018