Crossword clues for diopter
The Collaborative International Dictionary
Diopter \Di*op"ter\, ||Dioptra \Di*op"tra\, n. [L. dioptra, fr. Gr. ?. See 2d Dioptric.] An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc. [1913 Webster] ||
Wiktionary
n. 1 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. 2 (context obsolete English) Any lens system, such as a telescope. 3 (context obsolete English) A theodolite or similar surveyor’s angle measuring device. 4 (context obsolete English) An alidade. 5 (context obsolete English) A surgical speculum. 6 (context obsolete English) An instrument for drawing the skull by projections.
WordNet
n. a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters
Wikipedia
- redirect Dioptre
In modern usage, diopter or dioptre is a measure of the refractive power of an optical system.
Diopter may also refer to:
- Historically, a dioptric lens
- Any lens system, such as a telescope
- A diopter sight
- A close-up lens used in photography
- A theodolite or similar surveyor's angle measuring device
- A dioptra, an old surveying device
- An alidade
- A surgical speculum
- An instrument for drawing the skull by projections
Usage examples of "diopter".
Magnus, distinguished by his smart outfit and grey hair, was setting up his elaborate diopter while more junior staff had to settle for the basic gro ma Some were responsible for raising twenty-foot-high marked posts that helped in taking levels, while others were awkwardly deploying a huge set square to mark a right angle for the initial setting-out of the intersection of the two wings of the new palace.
When he finally looks up, dark brown eyes stare out of the thicket through rimless plus-three diopters, giving him the look of a pugnacious sea otter.