Classical Mythology. a shining cloud sometimes surrounding a deity when on earth.
a cloud, aura, atmosphere, etc., surrounding a person or thing: The candidate was encompassed with a nimbus of fame.
halo (def 1).
the type of dense clouds or cloud mass with ragged edges, that yields rain or snow; a rain cloud.
(initial capital letter) U.S. Aerospace. one of a series of polar-orbiting meteorological and environmental research satellites, the last of which Nimbus 7, launched 1978, was the first satellite designed to monitor atmospheric pollutants.