Word Study
optometer
CIDE DICTIONARY
optometer, n. [Optic + -meter.].
An instrument for measuring the distance of distinct vision, mainly for the selection of eveglasses. [1913 Webster]
OXFORD DICTIONARY
optometer, n. an instrument for testing the refractive power and visual range of the eye.
Derivative
optometric adj. optometry n.
Etymology
Gk optos seen + -METER
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