*cymoscope*

n. [ Gr. &unr_; 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. [ Webster 1913 Suppl. ]