One of the mysteries of the English language finally explained.
A person who celebrates or attends orgies; (also more generally) a person given to excessive indulgence in something.
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.
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