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The Collaborative International Dictionary of English v.0.48 (gcide)

Refract \Re*fract"\ (r?*fr$kt"), v. t. [imp. & p. p.
{Refracted}; p. pr. & vb. n. {Refracting}.] [L. refractus, p.
p. of refringere; pref. re- re- frangere to break: cf. F.
r['e]fracter. SEe {FRacture}, and cf. {Refrain}, n.]
1. To bend sharply and abruptly back; to break off.
[1913 Webster]

2. To break the natural course of, as rays of light orr heat,
when passing from one transparent medium to another of
different density; to cause to deviate from a direct
course by an action distinct from reflection; as, a dense
medium refrcts the rays of light as they pass into it from
a rare medium.
[1913 Webster]