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dust

noun [U]
 
 
/dʌst/

Definition

B1 dry dirt in the form of powder that covers surfaces inside a building, or very small dry pieces of soil, sand, or other substances: The furniture was covered in dust and cobwebs. A cloud of dust rose in the air as the car roared past. coal dustDirt and untidiness
(Definition of dust noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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