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particulate

noun [C usually plural]
 
 
/pəˈtɪ.kjuː.lət/ specialized

Definition

an extremely small piece of dirt, especially one produced by road vehicles, that causes pollutionEnvironmental issuesRubbish and wasteProtection and protectors
(Definition of particulate noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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