colloid

American  

[kol-oid] / ˈkɒl ɔɪd /

noun

1. 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 centimeters 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.

2. Medicine/Medical. a colloidal substance in the body, as a stored secretion or a cyst.

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adjective

1. Physical Chemistry. colloidal.

colloid British  

/ ˈkɒlɔɪd /

noun

1. Also called: colloidal solution.   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 a substance that in solution does not penetrate a semipermeable membrane Compare crystalloid

4. physiol a gelatinous substance of the thyroid follicles that holds the hormonal secretions of the thyroid gland

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adjective

1. pathol of or relating to the gluelike translucent material found in certain degenerating tissues

2. of, denoting, or having the character of a colloid

colloid Scientific  

/ kŏl′oid′ /

1. 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.

2. Compare solution suspension

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colloid Cultural  

1. 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.

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Discover More

Fog, paints, and foam rubber are colloids.

Other Word Forms

• noncolloid
  noun
• semicolloid
  noun

Etymology

Origin of colloid

First recorded in 1840–50; from Greek kóll(a) “glue” + -oid

Example Sentences

Colloid cysts typically form in a fluid-filled cavity in the centre of the brain, and are themselves filled with fluid, the Brains Trust says.

From BBC • Nov. 18, 2024

Colloid cancer; jelly-like substance.—The cancer cells have undergone a degeneration in one of the preceding varieties.

From Mother's Remedies Over One Thousand Tried and Tested Remedies from Mothers of the United States and Canada by Ritter, Thomas Jefferson

I yearn to bite on a Colloid With phosphorus, iron and Beans; I want to be filled with Calcium, grilled, And Veg'table Vitamines!

From The Book of Humorous Verse by Wells, Carolyn

Colloid, kol′oid, n. a name given by Graham, in contradistinction to crystalloids, to any soluble substance, which, when exposed to dialysis, does not pass through the porous membrane.—adj.

From Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) by Various

Colloid masses are sometimes met with—in lymphatic glands, for instance—as concretions, mulberry-like aggregations of stratified colloid bodies, which may be infiltrated with earthy salts.

From A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases by Various