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Adjective: .45-caliber
Usage: US (elsewhere: .45-calibre)
  1. Of or relating to the bore of a gun (or its ammunition) that measures forty-five hundredths of an inch in diameter
    "He carried a .45-caliber pistol";
    - .45 caliber [US], .45 calibre [Brit, Cdn], .45-calibre [Brit, Cdn]