English
wikipedia
Etymology
From F. dioptre < Latin dioptra or Greek διο���α, meaning to see through.<ref>The Compact Edition of the Oxford English Dictionary, Oxford University Press, 1971 </ref>
Noun
en-noun
- A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.
#obsolete Any lens system, such as a telescope
#obsolete A theodolite or similar surveyor's angle measuring device
#obsolete An alhidade
#obsolete A surgical speculum
#obsolete An instrument for drawing the skull by projections.
Translations
trans-top|unit of measure
Czech: dioptrie f
Finnish: dioptri
trans-mid
trans-bottom
References
<references/>
Category:Units of measure
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