calibre ( synonym found)
Definition of calibre:

(n) : diameter of the bore of a firearm. In rifled firearm barrels the calibre is obtained by measuring between opposite lands. A calibre 0.45 revolver has a barrel with a land diameter 45/100 of an inch. The metric equivalent is 11.43 millimeters; the diameter of round or cylindrical body, as of a bullet, a projectile, or a column
Definition of calibre:

(n) : diameter of the bore of a firearm. In rifled firearm barrels the calibre is obtained by measuring between opposite lands. A calibre 0.45 revolver has a barrel with a land diameter 45/100 of an inch. The metric equivalent is 11.43 millimeters; the diameter of round or cylindrical body, as of a bullet, a projectile, or a column
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