sun protection factor
noun
SPF.
Origin of sun protection factor
First recorded in 1975–80
Words nearby sun protection factor
sun pan,
sun parlor,
sun pillar,
sun porch,
sun prairie,
sun protection factor,
sun sign,
sun spider,
sun star,
sun tea,
sun valley
Medical definitions for sun protection factor
sun protection factor
n.
The ratio of the minimal ultraviolet dose required to produce erythema with and without a sunscreen; a measure of the degree to which a sunscreen protects the skin from ultraviolet radiation, the higher the number the greater degree of protection.
Scientific definitions for sun protection factor
sun protection factor
A measure, expressed numerically, of the degree to which a preparation containing sunscreen protects the skin from ultraviolet rays. The higher the value, the greater the level of protection from sun damage to the skin.