sun protection factor
noun
: a number assigned to a sunscreen that is the factor by which the time required for unprotected skin to become sunburned is increased when the sunscreen is used
—abbreviation SPF
Examples of sun protection factor in a Sentence
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This mineral formula boasts a high sun protection factor of SPF 75 in a richer, tinted formula that contains iron oxides to protect against visible light, including blue light, says Dr. Reszko.
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Emily Orofino, Vogue, 30 Oct. 2025
Wear sunscreen with a sun protection factor (SPF) of at least 30.
—Carrie Madormo, Health, 24 Oct. 2025
Both variants had a sun protection factor (SPF) of around 30, while also minimizing skin cell damage and inflammation.
—Andrew Paul, Popular Science, 4 Sep. 2025
Use sunscreen with a sun protection factor (SPF) of 30 or higher on your face, including the thin skin around your eyelids.
—Vanessa Caceres, Verywell Health, 3 Sep. 2025
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Emily Orofino, Vogue, 30 Oct. 2025
Wear sunscreen with a sun protection factor (SPF) of at least 30.
—Carrie Madormo, Health, 24 Oct. 2025
Both variants had a sun protection factor (SPF) of around 30, while also minimizing skin cell damage and inflammation.
—Andrew Paul, Popular Science, 4 Sep. 2025
Use sunscreen with a sun protection factor (SPF) of 30 or higher on your face, including the thin skin around your eyelids.
—Vanessa Caceres, Verywell Health, 3 Sep. 2025
See All Example Sentences for sun protection factor
Cite this Entry
“Sun protection factor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sun%20protection%20factor. Accessed 30 Nov. 2025.
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