calibre(redirected from calibers)
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See caliber, def. 1.
calibreThe diameter of a tube or cylinder.
The diameter of a bullet measured in hundredths of an inch—in the US and in English-speaking countries.
Common bullet calibres .22, .25, .30, .32, .38, and .45; in metric countries, calibres are measured in millimetres—e.g., .38 calibre corresponds to 9 mm