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noun Optics.
  1. an instrument for determining the refractive index of a substance.

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

Examples from the Web for refractometer

Historical Examples

  • Lacking a refractometer, the widely differing specific gravities of the two minerals would easily serve to distinguish them.

    A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public

    Frank Bertram Wade

British Dictionary definitions for refractometer


  1. any instrument for determining the refractive index of a substance
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

refractometer in Medicine


  1. Any of several instruments used to measure the refractive index of a substance.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.