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EnglishMerriam-Webster Dictionaryass='vi-before' aria-label='example sentence:'>//a cloud of blond hair //a ship under a cloud of sail
: 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 (such as electrons)
: a great crowd or multitude : swarm //clouds of mosquitoes