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refractometer

[ree-frak-tom-i-ter]
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noun Optics.
  1. an instrument for determining the refractive index of a substance.
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Origin of refractometer

First recorded in 1875–80; refract + -o- + -meter
Related formsre·frac·to·met·ric [ri-frak-tuh-me-trik] /rɪˌfræk təˈmɛ trɪk/, adjectivere·frac·tom·e·try, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for refractometry

refractometer

noun
  1. any instrument for determining the refractive index of a substance
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Derived Formsrefractometric (rɪˌfræktəˈmɛtrɪk), adjectiverefractometry, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

refractometry in Medicine

refractometry

(rē′frăk-tŏmĭ-trē)
n.
  1. Measurement of the refractive index of a substance with a refractometer.
  2. Use of a refractometer in determining the refractive error of the eye.
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refractometer

(rē′frăk-tŏmĭ-tər)
n.
  1. Any of several instruments used to measure the refractive index of a substance.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.