A lotion, spray, gel, or other topical product that absorbs or reflects some of the sun's ultraviolet (UV) radiation and thus helps protect against sunburn.
Before heading to the beach, she applied sunscreen to protect her skin from the sun's harmful rays.
sunscreenadjective
Designed to protect the skin from the sun's ultraviolet radiation; relating to or containing sunscreen.
She always uses a sunscreen lip balm when hiking.
sunscreenverb
To apply sunscreen to (someone or something).
Remember to sunscreen the kids before they start swimming.