a substance that forms a colloid when combined with water.
Origin of hydrocolloid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
A substance that forms a gel with water.
Such a substance used to take dental impressions, especially one derived from marine kelp.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.