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1563, from L. halo (acc.), from Gk. halos "disk of the sun or moon, ring of light around the sun or moon" (also "threshing floor" and "disk of a shield"), of unknown origin. Sense of "light around the head of a holy person or deity" first recorded 1646.nimbus
1616, "bright cloud surrounding a god," from L. nimbus "cloud," perhaps related to nebula "cloud, mist" (see nebula). Meaning "halo" is first recorded c.1730. Meteorological sense of "a rain cloud" is from 1803. Nimbostratus in the modern sense first attested 1932.