di·op·ter (d - p t r)n. Abbr. D. A unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length measured in meters. [Obsolete diopter, an instrument for measuring angles, from Latin dioptra, from Greek dioptr  : dia-, dia- + optos, visible; see okw- in Indo-European roots.]di·op tral (-trl) adj. |
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| Noun | 1. | 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 unit, unit of measurement - any division of quantity accepted as a standard of measurement or exchange; "the dollar is the United States unit of currency"; "a unit of wheat is a bushel"; "change per unit volume" |
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