sender policy framework: a mechanism designed to prevent an email address being duplicated and used as a false address from which to send unsolicited emails 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
WordReference Random House Unabridged Dictionary of American English © 2025
SPF,
- sun protection factor: the effectiveness of suntanning preparations in protecting the skin from the harmful effects of the sun's ultraviolet radiation, as rated on a scale of increasing protectiveness from 2 to 15 or sometimes higher.
Collins Concise English Dictionary © HarperCollins Publishers::
'SPF' also found in these entries (note: many are not synonyms or translations):