di·a·dem
noun/ˈdaɪədem/
/ˈdaɪədem/
- a small crown (= an object in the shape of a circle that is worn on the head, usually made of gold and precious stones), worn especially as a sign of royal power
王冠；冕 Word OriginMiddle English: from Old French diademe, via Latin from Greek diadēma ‘the regal headband of the Persian kings’, from diadein ‘bind round’.