Webster
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Webster’s Revised Unabridged Dictionary · 1913

Refractive

Re·fract′ive (r?·fr?kt′?v), a. [Cf. F. réfractif. See Refract.] 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.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek set in Greek letters; entries of one spelling made one article.