Dictionary![]() ![]() cal•vusPronunciation: (kal'vus), [key] —adj. Meteorol. (of a cumulonimbus cloud) having its upper portion changing from a rounded, cumuliform shape to a diffuse, whitish, cirriform mass with vertical striations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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