(in paintings, etc.) a circle of light shown around or above the head of a holy person （绘画等中环绕圣人头上的）光环，光轮 - (informal)
a corona (= a ring of light seen around the sun or moon, especially during an eclipse) 晕： 日冕
Word Originmid 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’.