noun
ultraviolet rays; UV radiation
Scientific and everyday term for ultraviolet light. Often used in contexts of sun protection, sterilization, and astronomy.
紫外線が強い日は日焼け止めを塗ったほうがいい。
On days with strong UV rays, you should apply sunscreen.
この窓ガラスは紫外線をカットします。
This window glass blocks ultraviolet rays.