1. Of or relating to the bore of a gun (or its ammunition) that measures forty-five hundredths of an inch in diameter
   - .45 caliber [US], .45 calibre [Brit, Cdn], .45-calibre [Brit, Cdn]

See also: caliber [US]

• pig lead
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• pigeon
• pigeon berry
• pigeon breast
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• pigeon guillemot
• pigeon hawk
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• pigeon-pea plant
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