: A substance that blocks the effect of the sun's harmful rays. Using lotions that contain sunscreens can reduce the risk of skin cancer, including melanoma.
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A topical product that protects the skin from ultraviolet-induced erythema and resists washing off; its use also reduces formation of solar keratoses and reduces ultraviolet-B-induced melanoma and nonmelanoma skin cancers and wrinkling.

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sun·screen -.skrēn n a preparation (as a lotion) applied to the skin to prevent sunburn (as by chemically absorbing ultraviolet radiation) also its active ingredient (as benzophenone) compare sunblock
sun·screen·ing adj

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sun·screen (sunґskrēn″) a topical agent that protects the skin from the effects of the sun's rays, either absorbing ultraviolet radiation or by reflecting the incident light, or both. Called also solar screen or sun screen. The term is often used interchangeably with sunblock.

Medical dictionary. 2011.

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