a device that activates an alarm or extinguisher in the event of a fire a thermostat for use at high temperatures
WordReference Random House Unabridged Dictionary of American English © 2025
py•ro•stat
(pī′rə stat′),USA pronunciation n.
- a thermostat for high temperatures.
- a safety device that, when a fire breaks out in its vicinity, automatically causes a mechanism to sound a warning alarm.
- pyro- + -stat
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