Webster's English Dictionary

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thermostat

1. ther.mo.stat \'th*r-m*-.stat\ \.th*r-m*-'stat-ik\ \-i-k(*-)le-\ n : an 
   automatic device for regulating (as by the supply of gas or electrici ty to 
   a heating apparatus) temperature; also : a similar device for actuating 
   fire alarms or for controlling automatic sprinklers - ther.mo.stat.ic aj
2. thermostat vt or ther.mo.stat.ed or ther.mo.stat.ted;  or 
   ther.mo.stat.ing;  or ther.mo.stat.ting : to provide with or control by a 
   thermostat