口こう径けい

こ

う

け

い

Common wordFreq.FrequencyTop 20,000

Meanings

Refers to the inner diameter of a tube, especially gun barrels, pipes, or optical instruments. Also used figuratively for the scale or scope of something.

この銃じゅうの口こう径けいは9ミリです。
The caliber of this gun is 9 mm.
望ぼう遠えん鏡きょうの口こう径けいが大おおきいほど、より多おおくの光ひかりを集あつめられる。
The larger the aperture of a telescope, the more light it can gather.

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Usage patterns

〈数かず〉ミリの口こう径けいa caliber/bore of ~ millimeters
このピストルの口こう径けいは9ミリだ。
This pistol has a caliber of 9 millimeters.
口こう径けいが大おおきい／小ちいさいto have a large/small caliber or bore
この大たい砲ほうは口こう径けいが大おおきい。
This cannon has a large caliber.
〈物もの〉の口こう径けいを測はかるto measure the caliber/bore of something
望ぼう遠えん鏡きょうの口こう径けいを測はかる。
He measured the aperture of the telescope.