DIOPTRE

diopter, dioptre

(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

Source: WordNet® 3.1

Noun

dioptre (plural dioptres)

Alternative spelling of diopter

Anagrams

• diopter, peridot, periodt, proetid, proteid, protide, pterido-, pteroid, reptoid

Source: Wiktionary

Di*op"tre, n. Etym: [F. See 2d Dioptric.] (Optics)

Definition: 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 Edition