adjective Physical Chemistry.
pertaining to or of the nature of a colloid: colloidal gold and silver.

1860–65; colloid + -al1

colloidality [kol-oi-dal-i-tee] , noun
colloidally, adverb
noncolloidal, adjective
semicolloidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
colloidal (ˌkɒˈlɔɪdəl)
of, denoting, or having the character of a colloid

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1861, from colloid + -al (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It is of a semifluid, viscid consistence, and probably colloidal in nature.
Two of these items are suspensions, and other is a colloidal dispersion.
The wet colloidal technique used was known for its many defect sources during the many step manual process.
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