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usually uncountable, plural mucilages
A thick gluey substance (gum) produced by many plants and some microorganisms. quotations examples
Malt liquors […] are distinguished from wine, chiefly by the larger quantity of mucilage and saccharine matter […]
1821, Friedrich Accum, A Treatise on the Art of Brewing, London: Longman, Hurst, Rees, Orme, & Brown, page 5