noun
thermostat
THMUHS-tat
noun
1
A device that automatically controls temperature by switching heating or cooling systems on or off.
"She turned the thermostat down before going to bed."
How to Use Thermostat
Learner’s notesIn plain EnglishThe control device that keeps a room or system at a set temperature.
Common pairings
adjust the thermostat
set the thermostat
Word Forms
thermostats plural
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She turned the _____ down before going to bed.
Etymology
From thermo- ("heat") plus -stat ("that which stabilizes").