thermostat
noun/ˈθɜːməstæt/
/ˈθɜːrməstæt/
- a device that measures and controls the temperature of a machine or room, by switching the heating or cooling system on and off as necessaryTopics Engineeringc2, Houses and homesc2Word Originmid 19th cent.: from thermo- ‘of heat’ + -stat.
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thermostat