One of the mysteries of the English language finally explained.
1Telecommunications. An instrument for transmitting sound by means of light; specifically that invented by Alexander Graham Bell and Sumner Tainter in 1880.
2Film. A system for producing synchronized soundtracks on films. Now disused.
Late 19th century; earliest use found in Alexander Graham Bell (1847–1922), teacher of deaf people and inventor of the telephone. From photo- + -phone.
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