di·a·dem /ˈdaɪəˌdɛm, dəm/
  王冠,帶狀頭飾,王權
  Di·a·dem n.
  1. Originally, an ornamental head band or fillet, worn by Eastern monarchs as a badge of royalty; hence (later), also, a crown, in general. “The regal diadem.”
  2. Regal power; sovereignty; empire; -- considered as symbolized by the crown.
  3. Her. An arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its center.
  Diadem lemur. Zool. See Indri.
  Diadem spider Zool., the garden spider.
  Di·a·dem, v. t. To adorn with a diadem; to crown.
     Not so, when diadem'd with rays divine.   --Pope.
  To terminate the evil,
  To diadem the right.   --R. H. Neale.
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  diadem
       n : an ornamental jewelled headdress signifying sovereignty
           [syn: crown]
  Diadem
     the tiara of a king (Ezek. 21:26; Isa. 28:5; 62:3); the turban
     (Job 29:14). In the New Testament a careful distinction is drawn
     between the diadem as a badge of royalty (Rev. 12:3; 13:1;
     19:12) and the crown as a mark of distinction in private life.
     It is not known what the ancient Jewish "diadem" was. It was the
     mark of Oriental sovereigns. (See CROWN.)