PHOTOPHONE

Etymology

Noun

photophone (plural photophones)

(historical) A device that transmitted sound on a beam of light.

Source: Wiktionary

Pho"to*phone, n. Etym: [Photo- + Gr. (Physics)

Definition: An apparatus for the production of sound by the action of rays of light. A. G. Bell.

Source: Webster’s Unabridged Dictionary 1913 Edition

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