Definition of photophone in English:

photophone

noun ˈfəʊtəʊfəʊn

historical

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.

Origin

Late 19th century; earliest use found in Alexander Graham Bell (1847–1922), teacher of deaf people and inventor of the telephone. From photo- + -phone.

Definition of photophone in US English:

photophone

nounˈfəʊtəʊfəʊn

historical

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.

Origin

Late 19th century; earliest use found in Alexander Graham Bell (1847–1922), teacher of deaf people and inventor of the telephone. From photo- + -phone.

词汇	photophone
释义	Definition of photophone in English: photophone noun ˈfəʊtəʊfəʊn historical 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. Origin Late 19th century; earliest use found in Alexander Graham Bell (1847–1922), teacher of deaf people and inventor of the telephone. From photo- + -phone. Definition of photophone in US English: photophone nounˈfəʊtəʊfəʊn historical 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. Origin 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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