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diopter
[ dahy-op-ter ]
/ daɪˈɒp tər /
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noun
Optics. a unit of measure of the refractive power of a lens, having the dimension of the reciprocal of length and a unit equal to the reciprocal of one meter. Abbreviation: D
an instrument, invented by Hipparchus, to measure the apparent diameter of the sun or moon or to estimate the size or elevation of distant objects.
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Also especially British, di·op·tre .
Origin of diopter
1585–95; <Latin dioptra<Greek: instrument for measuring height or levels, equivalent to di-di-3 + op- (for ópsesthai to see) + -tra noun suffix of means
OTHER WORDS FROM diopter
di·op·tral, adjectiveWords nearby diopter
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
How to use diopter in a sentence
A split-focus diopter is implemented, one of a few homages to De Palma’s Body Double.
Justin Simien talks ‘Bad Hair,’ following his genre obsessions, and getting ‘free as hell’ in ’80s horror satire|Isaac Feldberg|October 22, 2020|FortuneThe unit of power employed by spectacle-makers is termed the diopter or dioptric (see Spectacles).
Diopter, the unit in terms of which the power of a lens or curved mirror can be expressed.
The New Gresham Encyclopedia|Various
Medical definitions for diopter
diopter
[ dī-ŏp′tər ]
n.
A unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length measured in meters.
The American Heritage® Stedman's Medical Dictionary
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