AUDIOMETER
\ˌɔːdɪˈɒmɪtə], \ˌɔːdɪˈɒmɪtə], \ˌɔː_d_ɪ__ˈɒ_m_ɪ_t_ə]\
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An instrument, among the constituted parts of which are an induction-coil, a microphone key, and a telephone, devised to measure with precision the sense of hearing.
By Daniel Lyons
By Willam Alexander Newman Dorland