Why is the ninth month called September?
"to bend" (light, sound, heat, etc.), 1610s, back-formation from refraction, and in part from Latin refractus, past participle of refringere. Related: Refracted; refracting.
refract re·fract (rĭ-frākt')v. re·fract·ed, re·fract·ing, re·fracts
To deflect something, especially light, from a straight path by refraction.
To determine the refraction of an eye or a lens.