| 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. |
| SPF abbr. sun protection factor |
| sun protection factor n. Abbr. SPF The degree to which a sunscreen, suntan lotion, or similar preparation protects the skin from ultraviolet rays, usually expressed numerically. |
SPF abbr.
sun protection factor
SPF
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