dioptre

Other forms: dioptres

Definitions of dioptre
  1. 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
    synonyms: diopter
    see moresee less
    type of:
    unit, unit of measurement
    any division of quantity accepted as a standard of measurement or exchange
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