thermocurrent

from The Century Dictionary.

• noun The current, as of electricity, set up by heating a compound circuit consisting of two or more different metals.

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

• noun (Physics) A current developed or set in motion by heat; specif., an electric current, in a heterogeneous circuit, due to differences of temperature between the junctions of the substances of which the circuit is composed.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A current, as of electricity, developed or set in motion by the action of heat.