First Known Use: circa 1864
Dictionary
diopter
noun di·op·ter \dī-ˈäp-tər, ˈdī-ˌäp-\
Definition of DIOPTER
: a unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length in meters
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Origin of DIOPTER
diopter (an optical instrument), from Middle French dioptre, from Latin dioptra, from Greek, from dia- + opsesthai to be going to see — more at optic
Medical Dictionary
diopter
noun di·op·ter
Medical Definition of DIOPTER
: a unit of measurement of the refractive power of a lens equal to the reciprocal of the focal length in meters
Variants of DIOPTER
di·op·ter or chiefly British di·op·tre \dī-ˈäp-tər, ˈdī-ˌäp-\
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