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English definition of “Eustachian tube”

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Eustachian tube

noun [C] uk   /juːˌsteɪ.ʃənˈtjuːb/ us    /-ˈtuːb/ specialized
either of the two passages between the middle ear and the back of the nose, which open to allow pressure to be kept equal on both sides of the eardrum
(Definition of Eustachian tube from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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