(n.) A circular or ringlike formation; a ring or belt.

O annular muscle annulation annulus anthelion antisun areola aura aureola aureole blaze of glory brilliance brilliancy chaplet charisma circle circuit circumference circus closed circle corona coronet countersun crown cycle diadem disc discus disk envelope eternal return fairy ring garland glamour glory illustriousness lasso logical circle loop looplet lunar corona lunar halo luster magic magic circle mock moon mock sun moon dog mystique nimbus noose numinousness orbit paraselene parhelic circle parhelion radiance radius rainbow resplendence resplendency ring rondelle round roundel saucer solar corona solar halo sphincter splendor sun dog vesica vicious circle wheel wreath