Webster's English Dictionary

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halo

1. ha.lo \'ha--(.)lo-\ n or halos or haloes [L halos, fr. Gk halo-s 
   threshing floor, disk, halo] pl  1: a circle of light appearing to surround 
   the sun or moon and resulting fr om refraction or reflection of light by 
   ice particles in the atmosphere 2: something resembling a halo : as  2a: 
   NIMBUS  2b: a differentiated zone surrounding a central object  3: the aura 
   of glory, veneration, or sentiment surrounding an idealized per son or 
   thing
2. halo vt : to form into or surround with a halo