poultice (n.)

soft and usually warm mass of meal, etc., and herbs, applied to sores or inflammations on the body," a 17c. alteration of Middle English pultes (late 14c.), from Medieval Latin pultes, ultimately from Latin pultes, plural of puls "porridge" (see pulse (n.2)). The modern form in English predominated from mid-18c.

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Definitions of poultice from WordNet
poultice (v.)
dress by covering with a therapeutic substance;
Synonyms: plaster
poultice (n.)
a medical dressing consisting of a soft heated mass of meal or clay that is spread on a cloth and applied to the skin to treat inflamed areas or improve circulation etc.;
Synonyms: cataplasm / plaster