Webster's English Dictionary

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diadem

di.a.dem \'di--*-.dem, -d*m\ n [ME diademe, fr. OF, fr. L diadema, fr. Gk 
   diade-ma, fr. (Xdiadein to bind around, fr. dia- + dein to bind 1: CROWN; 
   specif : a headband worn as a badge of royalty  2: regal power or dignity