• WordNet 3.6
    • n thermoregulator a regulator for automatically regulating temperature by starting or stopping the supply of heat
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Webster's Revised Unabridged Dictionary
    • n Thermoregulator (Physics) A device for the automatic regulation of temperature; a thermostat.
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Century Dictionary and Cyclopedia
    • n thermoregulator A regulator depending upon the action of metals when exposed to heat, and used either to control heat or some other action. Usually they depend on one of two principles: either direct expansion, which lengthens a bar when heated, or the use of two bars of different expansion-coefficients, so that when heated to the same temperature one will be longer than the other, thus causing a compound bar of these two metals, when fixed at one end, to deflect laterally at the other. The Engineer (London), 1902, p. 469.
    • n thermoregulator A device for regulating the temperature of a heating-apparatus.
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In literature:

This allows it to use less energy than expected for thermoregulation at low temperatures.
"Metabolic Adaptation to Climate and Distribution of the Raccoon Procyon Lotor and Other Procyonidae" by John N. Mugaas
Nevertheless most of the lizards' movements were motivated by thermoregulation.
"Life History and Ecology of the Five-lined Skink, Eumeces fasciatus" by Henry S. Fitch

In science:

Parental care and the development of thermoregulation in red junglefowl.
Post-hatching parental care behaviour and hormonal status in a precocial bird