aureole

Short definition from Wiktionary

Noun

1. 1
   A circle of light or halo around the head of a deity or a saint.
2. 2
   Any luminous or colored ring that encircles something.
3. 3
   A corona.
4. 4
   A ring around an igneous intrusion.
5. 5
   Alternative form of aureola (“increment to blessedness”).

Verb

1. 1
   To surround with, or as if with, a halo.