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1. WordNet® 3.0 (2006)
diopter
    n 1: 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 [syn: diopter,
         dioptre]
2. The Collaborative International Dictionary of English v.0.48
Diopter \Di*op"ter\, Dioptra \Di*op"tra\, n. [L. dioptra, fr.
   Gr. ?. See 2d Dioptric.]
   An optical instrument, invented by Hipparchus, for taking
   altitudes, leveling, etc.
   [1913 Webster]
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