from the GNU version of the Collaborative International Dictionary of English

  • n. An instrument constructed on the principle of the photophone and used in spectrum analysis as an adjunct to the spectroscope.

from The Century Dictionary and Cyclopedia

  • n. An adaptation of the principle of the radiophone, devised by Bell to be used in spectrum analysis.


Sorry, no etymologies found.


    Sorry, no example sentences found.


Log in or sign up to get involved in the conversation. It's quick and easy.