Diadem

[Sarah]

An arch rising from the rim of a crown (rarely also of acoronet), and uniting with others over its center. Diadem lemur.(Zoöl.) See Indri.-- Diadem spider (Zoöl.), the garden spider.

[Sarah]

di·a·dem
n.

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

tr.v. di·a·demed, di·a·dem·ing, di·a·dems
[Middle English diademe, from Old French, from Latin diadma, from Greek, band, from diadein, to bind around : dia-, dia- dein, d-, to bind.]