Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive
  • adjective (Geom.) a Cartesian oval. See under Cartesian.
  • adjective (Optics) Of or pertaining to the dioptre, or to the metric system of numbering glasses.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

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

[Greek dioptrikos, from dioptrā, an optical instrument; see diopter.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Greek διοπτρικός. Compare diopter.

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