Definition of cataplasm in US English:

cataplasm

noun

archaic
  • another term for poultice
    • ‘Some cataplasms were composed of barley flour in the form of paste after being well warmed.’
    • ‘Pliny says, in so many words, that the cerates and cataplasms, plasters, collyria, and antidotes, so abundant in his time, as in more recent days, were mere tricks to make money.’
    • ‘It is used in the form of cataplasms, tonics, salves and plasters.’
    • ‘The thin aqueous cataplasm retains a moisture-protecting effect on the skin and provides comfortable feeling in its use.’
    • ‘It is employed where a cooling and astringent cataplasm is required.’

Origin

Middle English: from Old French cataplasme or late Latin cataplasma, from Greek kataplasma, from kataplassein ‘plaster over’.

Pronunciation

cataplasm

/ˈkadəˌplazəm//ˈkædəˌplæzəm/