UPF
Americanabbreviation
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ultraviolet protection factor: the effectiveness of clothing fabrics in protecting the skin from the sun’s ultraviolet UVA and UVB radiation, rated on a scale of increasing protectiveness, the number being the ratio of the radiation dose needed to produce minimal redness when wearing the fabric compared to the dose needed to produce the same redness when not wearing it.
A shirt with a UPF of 50 will reduce your ultraviolet exposure by 50 times (98% UV blockage).
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ultra-processed food.
Etymology
Origin of UPF
UPF as "ultraviolet protection factor" first recorded in 1985–90
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.
To estimate UPF consumption, the researchers analyzed two 24-hour dietary recalls from each participant and calculated the share of daily calories that came from ultra-processed foods.
From Science Daily ● Aug. 27, 2026
Instead, it measures what researchers think a UPF should look like.
From Slate ● Jul. 12, 2026
Look out for fabrics that are best at blocking radiation from the sun, labelled "UPF 50".
From BBC ● Jun. 19, 2026
In addition, the report says healthcare professionals should encourage patients to reduce UPF consumption alongside standard advice about exercise, smoking, alcohol use, and overall nutrition.
From Science Daily ● May 10, 2026
This is where UPF subcategories and better nutrition education could be helpful.
From MarketWatch ● Mar. 23, 2026
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