Definition of thermostat noun from the Oxford Advanced Learner's Dictionary

 

thermostat

 noun
noun
BrE BrE//ˈθɜːməstæt//
 
; NAmE NAmE//ˈθɜːrməstæt//
 
Devices
 
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a device that measures and controls the temperature of a machine or room, by switching the heating or cooling system on and off as necessary thermostat See related entries: Devices Word Origin mid 19th cent.: from thermo- ‘of heat’ + -stat.
See the Oxford Advanced American Dictionary entry: thermostat