SPF

American  

abbreviation

1. 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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SPF ¹ British  

abbreviation

1. 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

2. 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

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S.P.F. ² British  

abbreviation

1. vet science specific pathogen free; denoting animals specially bred to ensure that they are free of specified diseases

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Example Sentences

My skin was tinged white from SPF 70 sunscreen.

From Los Angeles Times

But the former judge stood down months after refusing an SPF call to resign over concerns about his meetings with Mr Bayoh's family.

From BBC

But lawyers for the SPF said it was "of deep concern" that a similar invite had not been extended to the officers involved to "reflect parity".

From BBC

He confirmed he was standing down as inquiry chairman on Tuesday, after refusing calls to quit by the SPF two months earlier.

From BBC

He said it followed a move by the SPF to raise a judicial review of his decision, on 13 August, to continue in his role.

From BBC