a number indicating the relative effectiveness of a sunblock in preventing certain ultraviolet rays from burning the skin: a higher number indicates a greater degree of protection
sun protection factor
sun protection factorWebster's New World College Dictionary, Fifth Edition Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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"sun protection factor." YourDictionary, n.d. Web. 12 December 2018. <https://www.yourdictionary.com/sun-protection-factor>.
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sun protection factor. (n.d.). Retrieved December 12th, 2018, from https://www.yourdictionary.com/sun-protection-factor
sun protection factor
noun
Abbr. SPFA 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.
THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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"sun protection factor." YourDictionary, n.d. Web. 12 December 2018. <https://www.yourdictionary.com/sun-protection-factor>.
APA Style
sun protection factor. (n.d.). Retrieved December 12th, 2018, from https://www.yourdictionary.com/sun-protection-factor
A measure, expressed numerically, of the degree to which a preparation containing sunscreen protects the skin from ultraviolet rays. The higher the value, the greater the level of protection from sun damage to the skin.
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MLA Style
"sun protection factor." YourDictionary, n.d. Web. 12 December 2018. <https://www.yourdictionary.com/sun-protection-factor>.
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sun protection factor. (n.d.). Retrieved December 12th, 2018, from https://www.yourdictionary.com/sun-protection-factor
Noun
(plural sun protection factors) (abbreviated as SPF)
- an indication of how long a sunscreen remains effective when applied to the skin
- If someone normally burns in 10 minutes with no sunscreen, then a sunscreen with sun protection factor 20 will provide protection for up to 20x10 = 200 minutes
English Wiktionary. Available under CC-BY-SA license.
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"sun protection factor." YourDictionary, n.d. Web. 12 December 2018. <https://www.yourdictionary.com/sun-protection-factor>.
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sun protection factor. (n.d.). Retrieved December 12th, 2018, from https://www.yourdictionary.com/sun-protection-factor
sun protection factor - Medical Definition
n. Abbr. SPF
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.
The American Heritage Dictionary of Medicine © 2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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MLA Style
"sun protection factor." YourDictionary, n.d. Web. 12 December 2018. <https://www.yourdictionary.com/sun-protection-factor>.
APA Style
sun protection factor. (n.d.). Retrieved December 12th, 2018, from https://www.yourdictionary.com/sun-protection-factor
