Pronunciation: (sir"ō-strā'tus, -strat'us), [key]
pl. -tus.

a cloud of a class characterized by a composition of ice crystals and often by the production of halo phenomena and appearing as a whitish and usually somewhat fibrous veil, often covering the whole sky and sometimes so thin as to be hardly discernible: of high altitude, ab. 20,000–40,000 ft. (6000–12,000 m).

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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