/ ˈheɪləʊ; NAmE -loʊ/ noun ( pl. -oes or -os )
1.
(in paintings, etc.) a circle of light shown around or above the head of a holy person :
She played the part of an angel, complete with wings and a halo.
( figurative )
a halo of white frizzy hair
2.
= corona
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WORD ORIGIN
mid 16th cent. (denoting a circle of light round the sun etc.): from medieval Latin , from Latin halos , from Greek halōs disc of the sun or moon.