You searched for: “audiphone
audiphone (s) (noun), audiphones (pl)
An device consisting of a diaphragm or plate that is placed against the teeth and conveys sound vibrations to the inner ear enabling persons with certain types of deafness to hear more or less distinctly: An audiphone is a kind of hearing aid used by individuals with certain types of hearing impairment which transmits sounds to the auditory nerves in the inner ear by way of the bones in the head.