CLOUD

I. noun Usage: often attributive Etymology: Middle English, rock, ~, from Old English clūd; perhaps akin to Greek gloutos buttock Date: 14th century a visible mass of particles of condensed vapor (as water or ice) suspended in the atmosphere of a planet (as the earth) or moon, something resembling or suggesting a ~: as, a light filmy, puffy, or billowy mass seeming to float in the air , b. a usually visible mass of minute particles suspended in the air or a gas, an aggregation of usually obscuring matter especially in interstellar space, an aggregate of charged particles (as electrons), a great crowd or multitude ; swarm , something that has a dark, lowering, or threatening aspect , something that obscures or blemishes , a dark or opaque vein or spot (as in marble or a precious stone), II. verb Date: 1562 intransitive verb to grow ~y, 2. to become troubled, apprehensive, or distressed in appearance , to become blurry, dubious, or ominous, to billow up in the form of a ~, transitive verb 1. to envelop or hide with or as if with a ~ , to make opaque especially by condensation of moisture , to make murky especially with smoke or mist , to make unclear or confused , taint , sully , to cast gloom over