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cal·i·ber or chiefly Brit cal·i·bre 'kal-ə-bər, Brit also kə-'lē- n the diameter of a round or cylindrical body esp the internal diameter of a hollow cylinder
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cal·i·ber (kalґĭ-bər) [Fr. calibre the bore of a gun] the diameter of a canal or tube.Medical dictionary. 2011.