Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
- 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
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.