means A lotion, cream, or spray you apply to your skin to block or absorb the sun's ultraviolet rays and prevent burning and damage.

from A straightforward English compound: "sun" (Old English sunne, the same root that lights up sundial and sunflower) plus "screen" (which arrived via Old French escren, meaning a shield or partition against heat or draft). So the word literally promises a screen against the sun — a 20th-century coinage that followed the rise of commercial sun-protection products, an era when people finally decided a tan wasn't worth a peel.