Webster 1913 Edition
imp. & p. p.
p. pr. & vb. n.
To bend sharply and abruptly back; to break off.
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.
refrctsthe rays of light as they pass into it from a rare medium
Webster 1828 Edition
To break the natural course of the rays of light; to cause to deviate from a direct course. A dense medium refracts the rays of light, as they pass into it from a rare medium.