A cave, cavern, or any large hollow space, especially one that is dark or mysterious.
From French 'antre,' derived from Latin 'antrum' and Greek 'antron,' both meaning 'cave.' The word entered English poetic and literary usage in the 16th-17th centuries, borrowed from French literary tradition.
The word 'antre' is seldom used in modern English except in poetry and fantasy literature, where it creates an archaic, mysterious atmosphere—you'll find it in works like Spenser's 'The Faerie Queene' and fantasy novels wanting to sound magical and old.
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