dioptometer

English

Etymology

Etymology tree
English di-
Proto-Indo-European *h₃ekʷ-der.
Ancient Greek ὄπωπᾰ (ópōpă)
Proto-Indo-European *-tós
Proto-Hellenic *-tós
Ancient Greek -τός (-tós)
Ancient Greek ὀπτός (optós)der.
English opto-
Proto-Indo-European *med-
Proto-Indo-European *meh₁-
Proto-Indo-European *-tḗr
Proto-Indo-European *-om
Proto-Indo-European *-trom
Proto-Hellenic *-tron
Ancient Greek -τρον (-tron)
Ancient Greek μέτρον (métron)lbor.
French -mètrebor.
English -meter
English dioptometer

    From di- + opto- + -meter.

    Noun

    dioptometer (plural dioptometers)

    1. An instrument used to measure ocular refraction, in order to prescribe corrective lenses.
    • dioptometric
    • dioptometry
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