rus: диоптрия

Information
has URI	http://lexvo.org/id/term/rus/%D0%B4%D0%B8%D0%BE%D0%BF%D1%82%D1%80%D0%B8%D1%8F

Meaning
means	(noun) 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 diopter, dioptre