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The Collaborative International Dictionary
Cymoscope

Cymoscope \Cy"mo*scope\, n. [Gr. ? wave + -scope.] (Elec.) Any device for detecting the presence of electric waves. The influence of electric waves on the resistance of a particular kind of electric circuit, on the magnetization of steel, on the polarization of an electrolytic cell, or on the electric condition of a vacuum has been applied in the various cymoscopes.

Wiktionary
cymoscope

n. (context wireless telegraphy disused English) A (l en detector) of (l en electromagnetic) (l en wave waves).