Relating to or connected with the Anthesteria festival in ancient Greece.
From 'Anthesteria' (the festival) + '-ac' (suffix meaning relating to). This scholarly adjective is used in historical and classical studies contexts.
When historians describe 'anthesteriac practices,' they're talking about rituals from a 2,400-year-old festival where ancient Greeks had a specific week where normal social rules didn't apply—sound familiar?
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