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diopter

noun

di·​op·​ter dī-ˈäp-tər How to pronounce diopter (audio)
ˈdī-ˌäp-
: a unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length in meters

Example Sentences

Recent Examples on the Web Monoyer invented the diopter, a unit of measurement that determines the distance someone must be from a text to read it. Brett Molina, USA TODAY, 9 May 2017 Perhaps the glasses’ increasing diopters told a narrative. The Washington Post, The Mercury News, 13 Mar. 2017

Word History

Etymology

diopter (an optical instrument), from Middle French dioptre, from Latin dioptra, from Greek, from dia- + opsesthai to be going to see — more at optic

First Known Use

circa 1864, in the meaning defined above

Time Traveler
The first known use of diopter was circa 1864

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