from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to dioptrics.
  • adj. Relating to optical refraction; refractive.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Pertaining to a diopter.
  • adj. Acting as a medium for sight; making use of refraction (of lenses, etc.).
  • adj. Capable of being seen through.
  • n. The branch of optics concerned with refraction.
  • n. A dioptric telescope.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to the dioptre, or to the metric system of numbering glasses.
  • adj. Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive

from The Century Dictionary and Cyclopedia

  • Affording a medium for the sight; assisting vision in the view of distant objects.
  • Pertaining to dioptrics, or the science of refracted light.
  • n. A unit of refractive power of a lens (or inverse focal length), equal to unity divided by a meter.


From Greek dioptrikos, of a diopter, from dioptrā, diopter; see diopter.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Greek διοπτρικός. Compare diopter. (Wiktionary)



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