三さん稜りょう鏡きょう

noun

prism

Technical term for an optical prism, especially a triangular glass prism used to disperse light. Rare in everyday conversation; プリズム is the common modern term.

• 三さん稜りょう鏡きょうに光ひかりを通とおすと、虹にじ色いろのスペクトルが現あらわれる。

  When light passes through a prism, a rainbow-colored spectrum appears.