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Answer for the clue "The physical property of a medium as determined by its index of refraction ", 14 letters:
refractiveness

Word definitions for refractiveness in dictionaries

Wiktionary Word definitions in Wiktionary
n. The quality or condition of being refractive.

WordNet Word definitions in WordNet
n. the physical property of a medium as determined by its index of refraction [syn: refractivity ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Refractiveness \Re*fract"ive*ness\, n. The quality or condition of being refractive.