Definition: (noun) A soft moist mass of bread, meal, clay, or other adhesive substance, usually heated, spread on cloth, and applied to warm, moisten, or stimulate an aching or inflamed part of the body.
Synonyms: cataplasm, plaster.
Usage: I heard from the ship’s doctor that he had been obliged to put a large mustard poultice on this very gentleman’s stomach.
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Source: The Free Dictionary