dioptre - WordReference.com Dictionary of English

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- - dint
  - diocesan
  - diocese
  - diode
  - dioecious
  - dioestrus
  - diol
  - Dionysiac
  - Diophantine equation
  - diopside
  - dioptre
  - dioptric
  - dioptrics
  - diorama
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  - diosgenin
  - dioxane
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dioptre

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Concise Oxford English Dictionary © 2008 Oxford University Press:
dioptre /dʌɪˈɒptə/ (US diopter)

▶noun a unit of refractive power, which is equal to the reciprocal of the focal length (in metres) of a given lens.

– origin C16 (orig. denoting an alidade, later a form of theodolite): from Fr., from L. dioptra, from Gk, from di- ‘through’ + optos ‘visible’.

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