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Answer for the clue "A substance that forms a gel with water ", 12 letters:
hydrocolloid

Word definitions for hydrocolloid in dictionaries

Wiktionary Word definitions in Wiktionary
n. 1 Any material that forms a colloid (especially a gel) when mixed with water 2 Such a material, made from agar, used to make dental impressions

WordNet Word definitions in WordNet
n. a substance that forms a gel with water

Usage examples of hydrocolloid.

He made a hydrocolloid impression of the entire lower jaw, since the better part of the reconstruction would have to take place in the laboratory.