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.
Origin of pyrostat
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a device that activates an alarm or extinguisher in the event of a fire
a thermostat for use at high temperatures
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012