halo

ha·lo

noun \ˈhā-(ˌ)lō\

plural halos or haloes

Definition of HALO

1

: a circle of light appearing to surround a luminous body; especially : one seen as the result of the presence of glaucoma

2

: a differentiated zone surrounding a central object <the halo around a boil>

3

: the aura of glory, veneration, or sentiment surrounding an idealized person or thing

4

: an orthopedic device used to immobilize the head and neck (as to treat fracture of neck vertebrae) that consists of a metal band placed around the head and fastened to the skull usually with metal pins and that is attached by extensions to an inflexible vest—called also halo brace