CATAPLASM
poultice, cataplasm, plaster
(noun) 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.
Source: WordNet® 3.1
Etymology
Noun
cataplasm (plural cataplasms)
(medicine) A poultice or plaster, spread over one's skin as medical treatment.
Synonyms
• poultice
Source: Wiktionary
Cat"a*plasm, n. Etym: [L. cataplasma, Gr. (Med.)
Definition: A soft and moist substance applied externally to some part of
the body; a poultice. Dunglison.
Source: Webster’s Unabridged Dictionary 1913 Edition