diopter

See also: Diopter

English

Alternative forms

• dioptra
• dioptre
• dioptry (obsolete)

Etymology

From French dioptre, from Latin dioptra, from Ancient Greek διοπτρα (dioptra, “to see through”).

Noun

diopter (plural diopters)

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. The dioptre adjustment mechanism of a pair of binoculars.
3. (obsolete) Any lens system, such as a telescope.
4. (obsolete) A theodolite or similar surveyor’s angle measuring device.
5. (obsolete) An alidade.
6. (obsolete) A surgical speculum.
7. (obsolete) An instrument for drawing the skull by projections.

Translations

unit of measure

• Basque: dioptria
• Catalan: diòptria f
• Czech: dioptrie f
• Finnish: dioptria, diopteri
• German: Dioptrie (de) f
• Hungarian: dioptria (hu)
• (deprecated template usage) {{trans-mid}}
• Italian: diottria (it) f
• Polish: dioptria (pl) f
• Portuguese: dioptria f
• Russian: дио́птрия (ru) f (dióptrija)
• Spanish: dioptría (es) f

lens system

• German: Diopter n
• (deprecated template usage) {{trans-mid}}

theodolite

• Finnish: teodoliitti (fi)
• (deprecated template usage) {{trans-mid}}
• German: Diopter n

alidade — see alidade

speculum — see speculum

instrument for drawing skull

• (deprecated template usage) {{trans-mid}}

Anagrams

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