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.
  1. resembling a crystal.
  2. of the nature of a crystalloid.

Origin of crystalloid

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

Examples from the Web for crystalloid

Historical Examples of crystalloid

British Dictionary definitions for crystalloid


  1. resembling or having the appearance or properties of a crystal or crystalloid
  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
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.
  1. Resembling or having properties of a crystal or crystalloid.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.