-stat

[суффикс, вторая часть сложных слов] -стат (стабилизирующее устройство) Например: rheostat — реостат photostat — фотостат thermostat — термостат

Большой англо-русский словарь

-stat

noun combining form Etymology: New Latin -stata, from Greek -statēs one that stops or steadies, from histanai to cause to stand — more at stand 1. stabilizing agent or device Example: thermostat 2. instrument for reflecting (something specified) constantly in one direction Example: heliostat 3. agent causing inhibition of growth without destruction Example: bacteriostat

Merriam-Webster's Collegiate Dictionary