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Definition of: thermostat
(thûr′mə·stat) noun
A device for the automatic regulation of temperature by means of a relay utilizing the expansion and contraction caused by temperature changes in certain metals: used for actuating fire alarms, opening or closing dampers, regulating steam pressures, etc. [<THERMO- + Gk. statos standing]
—ther′mo·stat′ic adjective
—ther′mo·stat′i·cal·ly adverb
a. Bimetal bar.
b. Contact points.
c. Control knob.
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