Dictionary![]() ![]() sun•blockPronunciation: (sun'blok"), [key] —n. 1. a substance that provides a high degree of protection against sunburn, often preventing most tanning as well as burning, as by obstructing the penetration of ultraviolet rays. 2. a lotion, cream, etc., containing such a substance. Also,sun' block". Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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