• synonyms


  1. a usually crystallizable substance that, when dissolved in a liquid, will diffuse readily through vegetable or animal membranes.
  2. Botany. one of certain minute crystallike granules of protein, found in the tissues of various seeds.
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  1. resembling a crystal.
  2. of the nature of a crystalloid.
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Origin of crystalloid

From the Greek word krystalloeidḗs, dating back to 1860–65. See crystall-, -oid
Related formscrys·tal·loi·dal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for crystalloid

Historical Examples

  • This arises from the fact that the molecules of a colloid are extremely large when compared with those of a crystalloid.

    The Mechanism of Life

    Stphane Leduc

  • The effect is produced by using a crystalloid band upon which the images are painted as represented at A in our engraving.

  • Cogitations concerning the Hindustani Interpreter: colloid and crystalloid: the Armenians comments.

    At the Court of the Amr

    John Alfred Gray

  • In about 24 hours three-quarters of the crystalloid substances present will have passed into the lower vessel.

British Dictionary definitions for crystalloid


  1. resembling or having the appearance or properties of a crystal or crystalloid
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  1. a substance that in solution can pass through a semipermeable membraneCompare colloid (def. 3)
  2. botany any of numerous crystals of protein occurring in certain seeds and other storage organs
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Derived Formscrystalloidal, adjective
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

crystalloid in Medicine


  1. A substance that in solution can pass through a semipermeable membrane and be crystallized, as distinguished from a colloid.
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  1. Resembling or having properties of a crystal or crystalloid.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.