caliber

口径

銃の銃身の内側の直径。

やさしい英語で： The width of the inside of a gun's barrel.

• What caliber is this rifle?
• The two pistols have different calibers.
• The technician measured the caliber of the barrel.

類義語： bore diameter

よく使う表現： rifle caliber, large caliber, caliber of something

直径

弾丸や柱などの丸い物の、中心を通って測った幅。

やさしい英語で： The distance across a round object, such as a bullet or column.

• They measured the caliber of the bullet.
• The projectiles differ in caliber.
• The diagram gives the caliber of each cylindrical column.

類義語： diameter

よく使う表現： bullet caliber, projectile caliber, caliber of something

口径長

銃身の長さを表す単位で、その銃身の内径に等しい。

やさしい英語で： A unit for a gun barrel's length, equal to the width of its inside.

• Barrel length can be expressed in calibers.
• This naval gun has a barrel forty calibers long.
• A caliber here measures length relative to bore width.

よく使う表現： in caliber units, caliber length measurement, caliber ratio