protection factor
noun
A measure of the extent to which something affords protection against the harmful effects of a particular phenomenon, based on a ratio of the effects experienced with and without protection; (sometimes) specifically = sun protection factor.
Origin
1950s; earliest use found in Proceedings of the National Academy of Sciences of the United States of America.
- equiangular spiral
- equid
- equidistance
- equidistant
- equidistantly
- equifinal
- equifinality
- equilateral
- equilibrate
- equilibration
- equilibrator
- equilibrial
- equilibrise
- equilibrist
- equilibrium
- equilibrize
- equine
- equine encephalitis
- equinoctial
- equinoctial line
- equinoctial point
- equinox
- equip
- equipage
- equipartition