Is “Calibre” a Scrabble word?

1.Diameter of the bore of a firearm, typically measured between opposite lands.

2.The diameter of round or cylindrical body, as of a bullet, a projectile, or a column.

3.A nominal name for a cartridge type, which may not exactly indicate its true size and may include other measurements such as cartridge length or black powder capacity. Eg 7.62×39 or 38.40.