Webster's English Dictionary

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cloud

1. cloud \'klau.d\ n [ME rock, cloud, fr. OE clu-d; akin to Gk gloutos 
   buttock] often attrib  1a: a visible mass of particles of water or ice in 
   the form of fog, mist, o r haze suspended usu. at a considerable height in 
   the air 1b: a light filmy, puffy, or billowy mass seeming to float in the 
   air  2: a usu. visible mass of minute particles suspended in the air or in 
   a gas ; also : one of the masses of obscuring matter in interstellar space 
   3: a great crowd or multitude : SWARM  4: something that has a dark, 
   lowering, or threatening aspect  5: something that obscures or blemishes  
   6: a dark or opaque vein or spot (as in marble) 
2. cloud vi 1: to grow cloudy  2a: of facial features : to become troubled, 
   apprehensive, or dist ressed in appearance 2b: to become blurry, dubious, 
   or ominous  3: to billow up in the form of a cloud  1a: to envelop or hide 
   with a cloud or as if by a cloud  1b: to make opaque esp. by condensation 
   of moisture  1c: to make murky esp. with smoke or mist  2: to make unclear 
   or indistinct  3: TAINT, SULLY  4: to cast gloom over