Source : Webster's Revised Unabridged Dictionary (1913)

Thermocouple \Ther"mo*cou`ple\, n.
   A thermoelectric couple.

Source : WordNet®

thermocouple
     n : 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
         [syn: {thermocouple junction}]