Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An instrument used for measuring ocular refraction.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An instrument used to measure ocular refraction, in order to prescribe corrective lenses

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

di(a)- + opt(ic) + -meter.

Examples

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