Refractive
Pronunciation : Re*fract"ive (r*frkt"v)
Part of Speech : a.
Etymology : [Cf. F. r?fractif. See Refract.]
Definition : Defn: Serving or having power to refract, or turn from a direct course; pertaining to refraction; as, refractive surfaces; refractive powers. Refractive index. (Opt.) See Index of refraction, under Index. -- Absolute refractive index (Opt.), the index of refraction of a substances when the ray passes into it from a vacuum. -- Relative refractive index (of two media) (Opt.), the ratio of the sine of the angle of incidence to the sine of the angle of refraction for a ray passing out of one of the media into the other.
Source : Webster's Unabridged Dictionary, 1913