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KPF.
abbreviation
-
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.
abbreviation
-
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
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sun protection factor: an indicator of how effectively a sun cream, lotion, cosmetic, etc, protects the skin from the harmful rays of the sun
SPF 25
"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
abbreviation
-
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
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any
opinions expressed do not reflect the views of Dictionary.com.
Inside, there are stations of SPF lotions, rows of toner pads and scanners that purport to analyze skin and scalp health.
From
The Wall Street Journal
• May 28, 2026
The NHS advises using sunscreen with an SPF factor of 30 or above and which offers at least 4-star UVA protection.
From
BBC
• May 26, 2026
SPF gloss goes great with her collection of wide-brimmed hats.
From
The Wall Street Journal
• Apr. 24, 2026
The overhaul comes after a report by Choice last June found 16 of the 20 sunscreens they tested - including several premium, expensive brands - failed to live up to their advertised SPF rating.
From
BBC
• Mar. 26, 2026
“Don’t you know anything about SPF? Skin cancer?”
From
"Beauty Queens" by Libba Bray
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
