Definition of helleborism in US English:

helleborism

noun

Medicine
rare
  • Originally: †any of various medicinal preparations containing hellebore (probably Veratrum album) (obsolete). In later use: treatment, especially homoeopathic treatment, or poisoning with hellebore (Veratrum or Helleborus species).

Origin

Early 17th century; earliest use found in Robert Burton (1577–1640), writer. From post-classical Latin elleborismus purgative made from hellebore or its etymon ancient Greek ἐλλεβορισμός, ἑλλεβορισμός treatment with hellebore from ἐλλεβορίζειν, ἑλλεβορίζειν + -ισμός.

Pronunciation

helleborism

/ˈhɛlɪbərɪz(ə)m/