Webster's English Dictionary

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stratus

stra.tus \'stra-t-*s, 'strat-\ \'stra-t-.i-, 'strat-\ n or stra.ti [NL, fr. 
   L, pp. of sternere] pl  : a cloud form of greater horizontal extension and 
   comparatively lower alt itude (2000 to 7000 feet) than the cumulostratus or 
   cirrostratus