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Noun: dioptre  dI'óp-tu(r)
Usage: Brit, Cdn (US: diopter)
  1. 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
    - diopter

Derived forms: dioptres

Type of: unit, unit of measurement

Encyclopedia: Dioptre