A gel (from the lat. gelu ?freezing, cold, ice or gelatus ?frozen, immobile) is an apparently solid, jelly-like material formed from a colloidal solution.
http://en.wikipedia.org/wiki/Gel

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gels, n.pl herbal suspensions made from gums, gelatin, or pectin that are used on mucosae and in cases in which long-lasting, slow-acting astringent properties are needed.
http://medical-dictionary.thefreedictionary.com/Gels

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