Physical Chemistry. a substance made up of a system of particles with linear dimensions in the range of about 10 −7 to 5 × 10 −5 cm dispersed in a continuous gaseous, liquid, or solid medium whose properties depend on the large specific surface area. The particles can be large molecules like proteins, or solid, liquid, or gaseous aggregates and they remain dispersed indefinitely. Compare aerosol, emulsion, gel, sol4, suspension.
Medicine/Medical. a colloidal substance in the body, as a stored secretion or a cyst.
Physical Chemistry, colloidal.

1840–50; < Greek kóll(a) glue + -oid

noncolloid, noun
semicolloid, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To colloid
World English Dictionary
colloid (ˈkɒlɔɪd)
1.  colloidal solution, Also called: colloidal suspension a mixture having particles of one component, with diameters between 10--7 and 10--9 metres, suspended in a continuous phase of another component. The mixture has properties between those of a solution and a fine suspension
2.  the solid suspended phase in such a mixture
3.  obsolete Compare crystalloid a substance that in solution does not penetrate a semipermeable membrane
4.  physiol a gelatinous substance of the thyroid follicles that holds the hormonal secretions of the thyroid gland
5.  pathol of or relating to the gluelike translucent material found in certain degenerating tissues
6.  of, denoting, or having the character of a colloid
[C19: from Greek kolla glue + -oid]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Word Origin & History

1847, from Fr. colloide (1845), from Gk. kolla "glue" + -eides "form."
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Medical Dictionary

colloid col·loid (kŏl'oid')

  1. A suspension of finely divided particles in a continuous medium from which the particles do not settle out rapidly and are not readily filtered.

  2. The particulate matter so suspended.

  3. The gelatinous stored secretion of the thyroid gland, consisting mainly of thyroglobulin.

  4. Gelatinous material resulting from colloid degeneration in diseased tissue. Also called colloidin.

Of, relating to, containing, or having the nature of a colloid.
col·loi'dal (kə-loid'l, kŏ-) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
colloid  [%PREMIUM_LINK%]     (kŏl'oid')  Pronunciation Key 
A mixture in which very small particles of one substance are distributed evenly throughout another substance. The particles are generally larger than those in a solution, and smaller than those in a suspension. Paints, milk, and fog are colloids. Compare solution, suspension.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
American Heritage
Cultural Dictionary
colloid [(kol-oyd)]

A substance made up of particles that are larger than most molecules; these particles do not actually dissolve in substances but stay suspended in them.

Note: Fog, paints, and foam rubber are colloids.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Example sentences
Colloid nodular goiters are also known as endemic goiters.
Vesicles containing colloid have been described as occurring in the parathyroid, but the observation has not been confirmed.
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature