from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a device that transmitted sound on a beam of light
from the GNU version of the Collaborative International Dictionary of English
- n. An apparatus for the production of sound by the action of rays of light.
from The Century Dictionary and Cyclopedia
- n. An instrument by which a beam of light may be made to transmit spoken words to a distance.
Sorry, no etymologies found.