‖n. [ F. See 2d Dioptric. ] (Optics) A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter. [ 1913 Webster ]
English-Thai: HOPE Dictionary [with local updates]
(n) 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, Syn.dioptre
The Collaborative International Dictionary of English (GCIDE) v.0.53
‖n. [ F. See 2d Dioptric. ] (Optics) A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter. [ 1913 Webster ]
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