(adj) of or relating to the bore of a gun (or its ammunition) that measures twenty-two hundredths of an inch in diameter, Syn..22-calibre, .22 calibre, .22-caliber
(adj) of or relating to the bore of a gun (or its ammunition) that measures thirty-eight hundredths of an inch in diameter, Syn..38-caliber, .38-calibre, .38 calibre
(adj) of or relating to the bore of a gun (or its ammunition) that measures forty-five hundredths of an inch in diameter, Syn..45-calibre, .45 calibre, .45-caliber
{ } n. [ F. calibre, perh. fr. L. qualibra of what pound, of what weight; hence, of what size, applied first to a ball or bullet; cf. also Ar. qālib model, mold. Cf. Calipers, Calivere. ] [ 1913 Webster ]
1. (Gunnery) The diameter of the bore, as a cannon or other firearm, or of any tube; or the weight or size of the projectile which a firearm will carry; as, an 8 inch gun, a 12-pounder, a 44 caliber. [ 1913 Webster ]
The caliber of empty tubes. Reid. [ 1913 Webster ]
A battery composed of three guns of small caliber. Prescott. [ 1913 Webster ]
☞ The caliber of firearms is expressed in various ways. Cannon are often designated by the weight of a solid spherical shot that will fit the bore; as, a 12-pounder; pieces of ordnance that project shell or hollow shot are designated by the diameter of their bore; as, a 12 inch mortar or a 14 inch shell gun; small arms are designated by hundredths of an inch expressed decimally; as, a rifle of .44 inch caliber. [ 1913 Webster ]
2. The diameter of round or cylindrical body, as of a bullet or column. [ 1913 Webster ]
3. Fig.: Capacity or compass of mind. Burke. [ 1913 Webster ]
Caliber compasses. See Calipers. -- Caliber rule, a gunner's calipers, an instrument having two scales arranged to determine a ball's weight from its diameter, and conversely. -- A ship's caliber, the weight of her armament. [ 1913 Webster ]
a. Smaller than the caliber of a firearm. [ Written also subcalibre. ] [ 1913 Webster ]
Subcaliber projectile, a projectile having a smaller diameter than the caliber of the arm from which it is fired, and to which it is fitted by means of a sabot. Knight. [ 1913 Webster ]
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