Aureole

Etymology
From aureolus:

Noun

 * 1)  Corona.
 * 2) A circle of light or halo around the head of a deity.
 * 3)  Any luminous or colored ring that encircles something.

Derived terms

 * aureolate

Thesaurus
O; annular muscle; annulus; anthelion; antisun; areola; aura; chaplet; circle; circuit; circumference; circus; closed circle; corona; coronet; countersun; crown; cycle; diadem; discus; disk; eternal return; fairy ring; garland; glory; halo; lasso; logical circle; loop; looplet; lunar corona; lunar halo; magic circle; mock moon; mock sun; moon dog; nimbus; noose; orbit; paraselene; parhelic circle; parhelion; radius; rainbow; ring; rondelle; round; roundel; saucer; solar corona; solar halo; sphincter; sun dog; vicious circle; wheel; wreath