osteophone
(ˈɒstiːəʊfəʊn)
[f. osteo- + Gr. ϕωνή sound, after telephone, etc.]
An instrument for the transmission of sound-waves through the teeth and the cranial bones to the auditory nerve, for the use of the deaf; = audiphone.
| 1892 in Syd. Soc. Lex. |