from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A measure of the degree to which a sunscreen protects the skin from ultraviolet radiation, expressed as a number representing the ratio of the minimal ultraviolet dose required to produce erythema with and without sunscreen.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun an
indicationof how long a sunscreenremains effectivewhen applied to the skin
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the degree to which a sunscreen protects the skin from the direct rays of the sun
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