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sun protection factor
1. (Telecommunications) 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. (Chemical Engineering) 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.
sun protection factor: the effectiveness of suntanning preparations in protecting the skin from ultraviolet radiation.
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|Noun||1.||SPF - the degree to which a sunscreen protects the skin from the direct rays of the sun|