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sun protection factor: the effectiveness of a sunscreen in protecting the skin from the sun's ultraviolet UVB radiation, as rated on a scale of increasing protectiveness, the number being the ratio of the radiation dose needed to produce minimal redness when using sunscreen compared to the dose needed to produce the same redness without sunscreen: An SPF of 15 will allow you to stay in the sun 15 times longer.
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Question 1 of 7
Which sentence is correct?
Words nearby SPF
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use SPF in a sentence
SPF is in our moisturizers, lip balms, eye creams, and make-up.Is the Facekini the Future of Beachwear?|Justin Jones|August 23, 2014|DAILY BEAST
You can buy a cellphone the way you choose SPF-labeled sunscreen: by SAR, or specific absorption rate.Are Cellphones Really a Cancer Risk?|Sharon Begley|June 1, 2011|DAILY BEAST
British Dictionary definitions for SPF (1 of 2)
sender policy framework: a mechanism designed to prevent an e-mail address being duplicated and used as a false address from which to send unsolicited e-mails
sun protection factor: an indicator of how effectively a sun cream, lotion, cosmetic, etc, protects the skin from the harmful rays of the sunSPF 25
British Dictionary definitions for SPF (2 of 2)
vet science specific pathogen free; denoting animals specially bred to ensure that they are free of specified diseases
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