Definition of impostume in English:

impostume

(also imposthume)

noun

archaic
  • A swelling containing pus; an abscess.

    ‘an impostume in his breast’
    ‘the patient was dangerously ill of an imposthume’

Origin

Late Middle English: from Old French empostume, alteration of apostume, from Latin and Greek apostema ‘separation of pus into an abscess’, from Greek apostēnai ‘withdraw’.

Pronunciation

impostume

/ɪmˈpɒstjuːm/