di·a·dem
n.
1. A crown worn as a sign of royalty.
2. 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.
To
adorn with or as if with a diadem.
Not so, when
diadem'd with rays divine. --Pope.
To terminate the evil, To diadem the right. --R. H.
Neale.