noun
Word Origin Middle English: from Old French diademe, via Latin from Greek diadēma ‘the regal headband of the Persian kings’, from diadein ‘bind round’.
Derivatives
Scrabble Points: 10
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Ornamental headband worn by monarchs and others as a badge of royalty or local tradition
A diadem is a type of crown, specifically an ornamental headband worn by monarchs and others as a badge of royalty. Wikipedia