refractional
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refractional — See refraction. * * * … Universalium
refraction — refractional, adj. /ri frak sheuhn/, n. 1. Physics. the change of direction of a ray of light, sound, heat, or the like, in passing obliquely from one medium into another in which its wave velocity is different. 2. Ophthalm. a. the ability of the … Universalium
refractiveness — See refractional. * * * … Universalium
refractively — See refractional. * * * … Universalium
RGD — range gated Doppler; refractional geometric distortions [imaging] … Medical dictionary
RGD — • range gated Doppler; • refractional geometric distortions [imaging] … Dictionary of medical acronyms & abbreviations
refraction — /rəˈfrækʃən / (say ruh frakshuhn) noun 1. Physics the change of direction of a ray of light, heat, or the like, in passing obliquely from one medium into another in which its speed is different. 2. Optics a. the ability of the eye to refract… …
refract — v.t. deflect (ray of light etc.) on its passage from a medium to another of different density, with, usually, dispersion or splitting up of the ray; distort. ♦ refraction, n. ♦ refractor, n. ♦ refractional, ♦ refractive, a. ♦… … Dictionary of difficult words
