a substance that forms a colloid when combined with water.

1925–30; hydro-1 + colloid

hydrocolloidal [hahy-droh-kuh-loid-l] , adjective
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Medical Dictionary

hydrocolloid hy·dro·col·loid (hī'drə-kŏl'oid')

  1. A substance that forms a gel with water.

  2. Such a substance used to take dental impressions, especially one derived from marine kelp.

The American Heritage® Stedman's Medical Dictionary
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