Definition of orgiast in US English:

orgiast

noun

  • A person who celebrates or attends orgies; (also more generally) a person given to excessive indulgence in something.

Origin

Late 18th century; earliest use found in The Spirit of the Public Journals. From Hellenistic Greek ὀργιαστής person who celebrates orgies from ὀργιάζειν to celebrate orgies + -της, suffix forming agent nouns.

Pronunciation

orgiast

/ˈɔːdʒɪast/