Definitions

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

  • noun (Optics) 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 Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Alternative spelling of diopter.

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

  • noun 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

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