A type of cave or cavern, especially an underground chamber (archaic or dialectal term).
From Old French 'antre', from Latin 'antrum' (itself from Greek 'antron' meaning 'cave'), which came into English through Norman French influence after 1066, still appearing in medical terms like 'antrum'.
The word 'antrum' in medical terminology (like 'mastoid antrum') preserves the Latin meaning of 'cave,' showing how medical language freezes ancient vocabulary in specialized contexts—a skeleton key to English etymology.
Complete word intelligence in one call. Free tier — 50 lookups/day.