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dioptre
WORDNET DICTIONARY
Noun dioptre has 1 sense
- dioptre(n = noun.quantity) diopter - 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; Array is a kind of unit, unit of measurement
OXFORD DICTIONARY
dioptre, n. (US diopter) Optics a unit of refractive power of a lens, equal to the reciprocal of its focal length in metres.
Etymology
F dioptre f. L dioptra f. Gk dioptra: see DIOPTRIC
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