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English definition of “eardrum”

eardrum

noun [C]     /ˈɪə.drʌm/ US  /ˈɪr-/
a thin piece of skin inside the ear that moves backwards and forwards very quickly when sound waves reach it, allowing you to hear sounds The ear
(Definition of eardrum noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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