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thermostat

noun
🔊/ˈθɜːməstæt/
🔊/ˈθɜːrməstæt/
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  1. 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温控器；恒温器Topics Engineeringc2
    Word Originmid 19th cent.: from thermo- ‘of heat’ + -stat.