A luminous circle, usually prismatically colored, round the
sun or moon, and supposed to be caused by the refraction of light
through crystals of ice in the atmosphere. Connected with halos there
are often white bands, crosses, or arches, resulting from the same
atmospheric conditions.

A circle of light; especially, the bright ring represented in
painting as surrounding the heads of saints and other holy persons; a
glory; a nimbus.

An ideal glory investing, or affecting one’s perception of,
an object.

A colored circle around a nipple; an areola.

To form, or surround with, a halo; to encircle with,
or as with, a halo.