DIOPTRE
Source: 567
‖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.
Source: 567
‖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.