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From Biology-Online Dictionary | Biology-Online Dictionary
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Origin: L, a rain storm, a rain cloud, the cloudshaped which enveloped the gods when they appeared on earth.

1. A circle, or disk, or any indication of radiant light around the heads of divinities, saints, and sovereigns, upon medals, pictures, etc.; a halo. See Aureola, and glory.

The nimbus is of pagan origin. As an atribute of power, the nimbus is often seen attached to the heads of evil spirits.

2. (Science: astronomy) A rain cloud; one of the four principal varieties of clouds. See Cloud.