diopter

  1. Noun.  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. Noun.  (obsolete) Any lens system, such as a telescope.
  3. Noun.  (obsolete) A theodolite or similar surveyor’s angle measuring device.
  4. Noun.  (obsolete) An alidade.
  5. Noun.  (obsolete) A surgical speculum.
  6. Noun.  (obsolete) An instrument for drawing the skull by projections.

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This entry was last updated on RefTopia from its source on 3/20/2012.