thermojunction

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The point of contact between two dissimilar metals in a thermocouple at which a thermoelectric current is produced.

from The Century Dictionary.

• noun The point of union of the two metals of a thermo-electric couple.
• noun There are two such points in the circuit of a thermo-element. It is upon the difference of temperature of the two junctions for a given pair of metals that the electromotive force of the element depends.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Elec.) A junction of two dissimilar conductors used to produce a thermoelectric current, as in one form of pyrometer; a thermocouple.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a junction between two dissimilar metals across which a voltage appears