Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Alternative spelling of diopter.

from the GNU version of the Collaborative International Dictionary of English

  • n. A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. 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

Etymologies

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