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Answer for the clue "A junction between two dissimilar metals across which a voltage appears ", 14 letters:
thermojunction

Word definitions for thermojunction in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Thermojunction \Ther`mo*junc"tion\, n. (Elec.) A junction of two dissimilar conductors used to produce a thermoelectric current, as in one form of pyrometer; a thermocouple.

WordNet Word definitions in WordNet
n. a junction between two dissimilar metals across which a voltage appears