1) Conjunction 2) Junction 
• (n.) A junction of two dissimilar conductors used to produce a thermoelectric current, as in one form of pyrometer; a thermocouple.
Synonym for thermocouple ... A device for measuring slight changes in temperature, consisting of two wires of different metals, one wire being kept at a certain low temperature, the other in the tissue or other material whose temperature is to be measured; a thermoelectric current is set up which is measured by a potentiometer. ... Synonym: thermoj...
Ther`mo·junc'tion noun (Electricity) A junction of two dissimilar conductors used to produce a thermoelectric current, as in one form of pyrometer; a thermocouple. 
Type: Term Pronunciation: ther′mō-jŭngk′shŭn Synonyms: thermocouple
[n] - a junction between two dissimilar metals across which a voltage appears
thermojunction The junction between the two dissimilar metal conductors of a thermocouple.
noun a junction between two dissimilar metals across which a voltage appears