- the power to refract.
Origin of refractivity
Also called refringence.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for refractivity
In this case small temperature changes alter the refractivity of the liquid without appreciably affecting the quartz.
In air and other gases, at ordinary pressures, the dispersion is very small, because the refractivity is small.
Glasses can now be made differing considerably both in refractivity and dispersive power.