Etymology
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thermocouple (n.)

also thermo-couple, 1862, from thermo-electric + couple (n.).

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Definitions of thermocouple

thermocouple (n.)
a kind of thermometer consisting of two wires of different metals that are joined at both ends; one junction is at the temperature to be measured and the other is held at a fixed lower temperature; the current generated in the circuit is proportional to the temperature difference;
Synonyms: thermocouple junction
From wordnet.princeton.edu