1. A circle of light around the sun or moon
   "A halo appeared around the moon, indicating the presence of ice crystals in the atmosphere"
    
2. An indication of radiant light drawn around the head of a saint
   "The halo in the painting emphasized the saint's holiness";
   - aura, aureole, nimbus, glory, gloriole, aureola
    
3. A toroidal shape
   "a halo of smoke";
   - ring, annulus, doughnut, anchor ring

Derived forms: haloes, halos

Type of: atmospheric phenomenon, light, lightness, toroid

Encyclopedia: Halo, Kentucky