refraction -
The turning or bending of any wave, such as a light or sound wave, when it passes from one medium into another of different opticaldensity.
refraction -
The degree to which a metal or compound can withstand heat.
Wikipedia
Refraction is the change in direction of a wave due to a change in its speed. This is most commonly observed when a wave passes from one medium to another at an angle other than 90°. Refraction of light is the most commonly observed phenomenon, but any type of wave can refract when it interacts with a medium, for example when sound waves pass from one medium into another or when water waves move into water of a different depth.
OmegaWiki Dictionary
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refraction The bending of light as it passes from one medium to another.