Calibres

Part of speech: noun

Definitions

1. A specific degree of internal diameter measurement in a tube or gun barrel
2. A standard measurement that indicates the size of a bullet or shell used in firearms
3. A designation for the dimensions of an object, particularly in the context of firearms or other cylindrical devices

Etymology: "Calibres" is the plural of "calibre," the internal diameter of a gun barrel or, more broadly, the width of any tube or the size of a projectile. The singular reached English from French, which had borrowed it from Italian "calibro," and that word traces back to Arabic "qālib," meaning a mould or form, a sense that fits a standard size being fixed by a mould.

Synonyms: diameters, sizes, gauges, measures, dimensions