Found 1 items, similar to Dioptre.
English → English (gcide) Definition: 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]