dioptre

- 3 dictionary results

di⋅op⋅ter

[dahy-op-ter]

–noun

1.	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

2.	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.

Also, especially British, di⋅op⋅tre.

Origin:
1585–95; < L dioptra < Gk: instrument for measuring height or levels, equiv. to di- di- ³ + op- (for ópsesthai to see) + -tra n. suffix of means

Related forms:

di⋅op⋅tral, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: di·op·ter
Variant: or chiefly British di·op·tre /dI-'äp-t&r, 'dI-"äp-/
Function: noun
: a unit of measurement of the refractive power of a lens equal to the reciprocal of the focal length in meters

Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

diopter di·op·ter (dī-ŏp'tər)
n.
Abbr. D.
A unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length measured in meters.

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