sunblock definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- a substance, as para-aminobenzoic acid, used in lotions, cosmetics, etc. to block certain ultraviolet rays of the sun and reduce the danger of sunburn; sunscreen
- a lotion, cosmetic, etc. containing this
Also written sun block
sunblock definition by American Heritage Dictionary
also sun blocknoun
A preparation that prevents sunburn by filtering out the sun's ultraviolet rays, often purported to offer more protection than a sunscreen.