\ˈɔːdɪfˌə͡ʊn], \ˈɔːdɪfˌəʊn], \ˈɔː_d_ɪ_f_ˌəʊ_n]\
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By Stedman, Thomas Lathrop
By William R. Warner
An instrument for enabling the deaf to hear; (1) A device for directing sound through the teeth, etc., to the auditory nerve; (2) an electrical device, resembling the receiver of a telephone instrument, which in churches, halls, etc., may be connected to a common telephone circuit, of which the transmitter si placed near the mounth of the speaker, while the receiver communicates the sound directly ot the ear of the hearer.
By James Champlin Fernald
By Willam Alexander Newman Dorland