'Refractiveness' definitions:

Definition of 'refractiveness'

From: WordNet
noun
The physical property of a medium as determined by its index of refraction [syn: refractivity, refractiveness]

Definition of 'Refractiveness'

From: GCIDE
  • Refractiveness \Re*fract"ive*ness\, n. The quality or condition of being refractive. [1913 Webster]