Definition of pyrostat in English:

pyrostat

Pronunciation /ˈpʌɪrə(ʊ)stat/

noun

rare
  • 1A thermostat, especially one operating at high temperatures; (originally) specifically a device for automatically regulating the draught through a chimney.

  • 2Any of various automatic devices for detecting a fire and triggering an alarm, sprinkler system, etc.

Origin

Mid 19th century; earliest use found in Andrew Ure (1778–1857), chemist.