| NOUN | quantity | diopter, dioptre | a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters |
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| Meaning | 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. | |
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| Synonym | dioptre | |
| Broader | unit of measurement, unit | Any division of quantity accepted as a standard of measurement or exchange |
| Spanish | dioptría | |
| Catalan | dioptria, diòptria | |
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