GALVANOSCOPE
\ɡˈalvɐnˌɒskə͡ʊp], \ɡˈalvɐnˌɒskəʊp], \ɡ_ˈa_l_v_ɐ_n_ˌɒ_s_k_əʊ_p]\
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An instrument or apparatus for detecting the presence of electrical currents, especially such as are of feeble intensity.
By Oddity Software
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An instrument or apparatus for detecting the presence of electrical currents, especially such as are of feeble intensity.
By Noah Webster.
By Willam Alexander Newman Dorland