NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,940 terms related to cancer and medicine.

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sunscreen
(SUN-skreen)
A substance that helps protect the skin from the sun's harmful rays. Sunscreens reflect, absorb, and scatter both ultraviolet A and B radiation to provide protection against both types of radiation. Using lotions, creams, or gels that contain sunscreens can help protect the skin from premature aging and damage that may lead to skin cancer.