Looking for the meaning of the word DIOPTRE in English for both noun and verb forms from the Oxford Dictionary? Below, you can explore all possible meanings and definitions of DIOPTRE with sentence examples. You can also use the “AUDIO PRONUNCIATION” track to check the correct pronunciation in British English.
Word: Dioptre
Speech Type: Noun
late 16th century (originally as diopter, denoting an alidade): from French, from Latin dioptra, from Greek, from di- ‘through’ + optos ‘visible’. The term was used in the early 17th century to denote an ancient form of theodolite; the current sense dates from the late 19th century
dʌɪˈɒptə
a unit of refractive power, which is equal to the reciprocal of the focal length (in metres) of a given lens
Short Definition:unit of refractive power, which is equal to reciprocal of focal length in metres of given lens
Examples:- vision corrected to within one dioptre of perfect sight
- diopter
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