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Answer for the clue "The physical property of a medium as determined by its index of refraction ", 12 letters:
refractivity

Word definitions for refractivity in dictionaries

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

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

Usage examples of refractivity.

Even with two flashlights and the unusually high refractivity of the mysterious material, shadows ruled the room.