coherer

noun
co·her·er | \kō-ˈhir-ər \

Definition of coherer 

: a radio detector in which an imperfectly conducting contact between pieces of conductive material loosely resting against each other is materially improved in conductance by the passage of high-frequency current

First Known Use of coherer

1894, in the meaning defined above

History and Etymology for coherer

cohere + -er entry 2

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The first known use of coherer was in 1894

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