.45

(firearms) A standard kind of firearm designed to fire bullets that are approximately 0.45 inch in diameter.

Japanese Meaning

約0.45インチ径の弾丸を発射するために設計された標準的な火器

The detective kept a .45 in a secured locker at the station.

刑事は署内の施錠されたロッカーに45口径の拳銃を保管していた。

Sense（1）

(firearms) A standard kind of firearm designed to fire bullets that are approximately 0.45 inch in diameter.

He was wearing the normal jungle fatigues and had a .45 in a holster on his waist.

.45s

（ plural ）