DIOPTER

diopter, dioptre

(noun) a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists

Source: WordNet® 3.1

Etymology

Noun

diopter (plural diopters)

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.

The dioptre adjustment mechanism of a pair of binoculars.

(obsolete) Any lens system, such as a telescope.

(obsolete) A theodolite or similar surveyor’s angle measuring device.

(obsolete) An alidade.

(obsolete) A surgical speculum.

(obsolete) An instrument for drawing the skull by projections.

Anagrams

• dioptre, peridot, periodt, proetid, proteid, protide, pterido-, pteroid, reptoid

Source: Wiktionary

Di*op"ter, Di*op"tra, n. Etym: [L. dioptra, fr. Gr. Dioptric.]

Definition: An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.

Source: Webster’s Unabridged Dictionary 1913 Edition

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