ˈthərmə+ˌ- noun
Etymology: therm- + couple
: a device for measuring temperature in which two electrical conductors of dissimilar metals (as copper and iron) are joined at the point where heat is to be applied and the free ends are connected to an electrical measuring instrument (as an ammeter) which by registering the amount of thermoelectric current being produced at the juncture of the dissimilar conductors indicates the temperature at that point