dioptric - WordReference.com Dictionary of English

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dioptric

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Concise Oxford English Dictionary © 2008 Oxford University Press:
dioptric /dʌɪˈɒptrɪk/

▶adjective relating to the refraction of light, especially in the organs of sight or in devices which aid or improve the vision.

– origin C17: from Gk dioptrikos, from dioptra, a kind of theodolite (see dioptre).

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