Definition of diadem

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< diadelphous

diaeresis >

di·a·dem    (d-dm, -dm) KEY 

NOUN:

1. A crown worn as a sign of royalty.
2. Royal power or dignity.

TRANSITIVE VERB:
di·a·demed, di·a·dem·ing, di·a·dems

To adorn with or as if with a diadem.

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ETYMOLOGY:
Middle English diademe, from Old French, from Latin diadma, from Greek, band, from diadein, to bind around : dia-, dia- + dein, d-, to bind