[ha.lo] n, pl halos or haloes [L halos, fr. Gk halos threshing floor, disk, halo] (1603) 1: a circle of light appearing to surround the sun or moon and resulting from refraction or reflection of light by ice particles in the atmosphere
2: something resembling a halo: as a: nimbus b: a region of space surrounding a galaxy that is sparsely populated with luminous objects (as globular clusters) but is believed to contain a great deal of dark matter c: a differentiated zone surrounding a central zone or object
3: the aura of glory, veneration, or sentiment surrounding an idealized person or thing
[2]halo vt (1801): to form into or surround with a halo "rainbows ~ed the waterfalls --Michael Crawford"