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dioptre
/ daɪˈɒptə /
noun
- a unit for measuring the refractive power of a lens: the reciprocal of the focal length of the lens expressed in metres
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Derived Forms
- diˈoptral, adjective
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Word History and Origins
Origin of dioptre1
C16: from Latin dioptra optical instrument, from Greek, from dia- through + opsesthai to see
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