蓄ちっ光こう

noun

phosphorescence; luminescence

Refers to materials that absorb light and then emit it slowly, often used in glow-in-the-dark products. Compare 夜光 (やこう), which can refer to any light emission at night, not necessarily from stored energy.

See also: 夜光

• この時計とけいの文も字じ盤ばんには蓄ちっ光こう塗と料りょうが使つかわれている。

  The dial of this watch uses phosphorescent paint.

• 蓄ちっ光こう素そ材ざいは光ひかりを蓄たくわえて暗くら闇やみで光ひかる。

  Phosphorescent materials store light and glow in the dark.