THERMOCOUPLE
thermocouple, thermocouple junction
(noun) 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
Source: WordNet® 3.1
Etymology
Noun
thermocouple (plural thermocouples)
(physics) A transducer consisting of two different metals welded together at each end; a voltage is produced that is proportional to the difference in temperature between the two junctions (one of which is normally held at a known temperature)
Source: Wiktionary
Ther"mo*cou`ple, n.
Definition: A thermoelectric couple.
Source: Webster’s Unabridged Dictionary 1913 Edition