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dioptre or (especially N Amer) diopter noun, optics (abbreviation dpt) a unit that is used to express the power of a lens, defined as one divided by the focal length of the lens, when the focal length is measured in metres, having a positive value for a converging lens and a negative value for a diverging lens.
ETYMOLOGY: 19c in this sense; 16c as the name of an optical instrument: from Greek dioptron spyglass.
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The Chambers Dictionary (13th edition)
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The Chambers Thesaurus
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Chambers Biographical Dictionary
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Consult Chambers 21st Century Dictionary, The Chambers Thesaurus (1996) or Chambers Biographical Dictionary (1997 edition with amendments). Enter your search and choose your title from the drop-down menu.
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