Meaning of impostume in English:

impostume

Pronunciation /ɪmˈpɒstjuːm/

noun

(also imposthume)
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’.