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earplug

noun [C usually plural]
 
 
/ˈɪə.plʌɡ/ US  /ˈɪr-/

Definition

a small piece of soft material, such as wax, cotton, or plastic, that you put into your ear to keep out noise or waterMedical dressings, supports and devices
(Definition of earplug noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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