phonophore

noun
pho·no·phore | \ ˈfōnəˌfō(ə)r \
plural -s

Definition of phonophore 

1a : a device that enables telephone messages to be sent over a telegraph line simultaneously with the use of ordinary currents operating code instruments

b : a system using this apparatus

2 : a device to enable the deaf to hear by conducting vibrations from the speaker's larynx to the hearer's teeth

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Other words from phonophore

phonophoric \¦⸗⸗¦fȯrik \ adjective

History and Etymology for phonophore

International Scientific Vocabulary phon- + -phore

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