Bible Dictionaries
Dioptre
Webster's Dictionary
(n.) 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.
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Bibliography Information
Webster, Noah. Entry for 'Dioptre'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/d/dioptre.html. 1828.