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dioptre n. 屈光度 屈光度 dioptre n 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 [synonym: {diopter}, {dioptre}] Dioptre \Di*op"tre\, 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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