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BNC: 43970 COCA: 38454
tympanumnoun [ C ]uk/ˈtɪm.pə.nəm/ us/ˈtɪm.pə.nəm/ plural tympana uk/ˈtɪm.pə.nə/ tympanums specialized

an eardrum (= a thin piece of skin inside the ear that moves backwards and forwards when sound waves reach it, allowing you to hear sounds)鼓膜


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