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Dioptre

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Definitions of Dioptre
Pronunciation : Di*op"tre
Part of Speech : n.
Etymology : [F. See 2d Dioptric.] (Optics)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913

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