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dioptre

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.09 sec.
dioptre or US diopter [die-op-ter]
Noun
a unit for measuring the refractive power of a lens [Greek dia- through + opsesthai to see]
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.dioptre - a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists
diopter
unit, unit of measurement - any division of quantity accepted as a standard of measurement or exchange; "the dollar is the United States unit of currency"; "a unit of wheat is a bushel"; "change per unit volume"


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