Diadem /(?)/

Di·a·dem

Diadem

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.
  2. Regal power; sovereignty; empire; -- considered as symbolized by the crown.
  3. An arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its center. (Her.)

Phrases & Compounds
Diadem lemur
See Indri.
Diadem spider
the garden spider.

Diadem

v. t.
  1. To adorn with a diadem; to crown.
    Not so, when diadem'd with rays divine.
    To terminate the evil, To diadem the right.