electroscope

noun
elec·tro·scope | \i-ˈlek-trə-ˌskōp \

Definition of electroscope 

: any of various instruments for detecting the presence of an electric charge on a body, for determining whether the charge is positive or negative, or for indicating and measuring intensity of radiation

First Known Use of electroscope

1776, in the meaning defined above

History and Etymology for electroscope

probably from French électroscope

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The first known use of electroscope was in 1776

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electroscope

noun
elec·tro·scope | \i-ˈlek-trə-ˌskōp \

Medical Definition of electroscope 

: any of various instruments for detecting the presence of an electric charge on a body, for determining whether the charge is positive or negative, or for indicating and measuring intensity of radiation

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