자외선이 · 자외선을
ultraviolet rays, UV
Example
여름에는 자외선이 강하니까 선크림을 바르세요.
UV rays are strong in summer, so put on sunscreen.
Word parts
자 purple+외 outside+선 ray
Literally 'beyond-purple ray', exactly like 'ultra-violet'.
Good to know
Sunscreen is also called 자외선 차단제, literally 'UV blocker'.
Related words