thermopile

noun
ther·​mo·​pile | \ ˈthər-mə-ˌpī(-ə)l \

Definition of thermopile 

: an apparatus consisting of thermocouples combined so as to multiply the effect and used for generating electric currents or determining intensities of radiation

First Known Use of thermopile

1849, in the meaning defined above

History and Etymology for thermopile

pile entry 4

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The first known use of thermopile was in 1849

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