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sunblock

[suhn-blok] /ˈsʌnˌblɒk/
noun
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.
Origin
1975-1980
1975-80; sun + block
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sun block

sun cream

noun
1.
a chemical, usually in the form of a cream, applied to exposed skin to block out all or almost all of the ultraviolet rays of the sun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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sun block in Medicine

sun block n.
A preparation, as of PABA, that prevents sunburn by filtering out the sun's ultraviolet rays, usually offering more protection than a sunscreen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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