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From The Collaborative International Dictionary of English v.0.48:
Nimbus \Nim"bus\, n.; pl. L. Nimbi, E. Nimbuses. [L., a rain storm, a rain cloud, the cloudshaped which enveloped the gods when they appeared on earth.] 1. (Fine Arts) 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, n., 5. [1913 Webster] Note: "The nimbus is of pagan origin." "As an attribute of power, the nimbus is often seen attached to the heads of evil spirits." --Fairholl. [1913 Webster] 2. (Meteor.) A rain cloud; one of the four principal varieties of clouds. See Cloud. [1913 Webster]