• WordNet 3.6
    • n thermopile a kind of thermometer for measuring heat radiation; consists of several thermocouple junctions in series
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Webster's Revised Unabridged Dictionary
    • n Thermopile (Physics) An instrument of extreme sensibility, used to determine slight differences and degrees of heat. It is composed of alternate bars of antimony and bismuth, or any two metals having different capacities for the conduction of heat, connected with an astatic galvanometer, which is very sensibly affected by the electric current induced in the system of bars when exposed even to the feeblest degrees of heat.
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Century Dictionary and Cyclopedia
    • n thermopile A thermo-electric battery, especially as arranged for the measurement of small quantities of radiant heat. See thermo-electricity.
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Webster's Revised Unabridged Dictionary
Thermo-, + pile, a heap


In literature:

Indeed, the thermopile in the hands of Lockyer has already made palpable the heat of the fixed stars.
"Scientific American Supplement, No. 288" by Various
The principle of the thermopile we need not describe in detail.
"Colour Measurement and Mixture" by W. de W. Abney