A device consisting of a number of thermocouples connected in series or parallel, used for measuring temperature or generating current. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "thermopile" in a sentence
"A thermopile is a unit that is mounted so that it is in the pilot light flame."
""thermopile,"  succeeded in making the lunar heat sensible; and in"
"Tom had installed his invention on top of the great plane and also a highly sensitive thermopile to record any effect of solar radiation on the liquid oxygen."