開かい口こう部ぶ

noun

aperture; opening

Technical term used in engineering, architecture, and optics for an opening or orifice.

• このカメラの開かい口こう部ぶは非ひ常じょうに小ちいさい。

  The aperture of this camera is very small.

• 建たて物ものの開かい口こう部ぶから光ひかりが差さし込こむ。

  Light comes in through the opening of the building.