thermostatically

WordReference Random House Learner's Dictionary of American English © 2026

ther•mo•stat /ˈθɜrməˌstæt/   n. [countable]

1. Thermodynamics a device that measures temperature and automatically turns on or off a heating or cooling device:
   The thermostat in the furnace didn't work properly.

ther•mo•stat•ic, adj. 
ther•mo•stat•i•cal•ly, adv. See -stat-,-therm-.

WordReference Random House Unabridged Dictionary of American English © 2026

ther•mo•stat  (thûr′mə stat′), n., v., -stat•ted or -stat•ed;
-stat•ting or -stat•ing. 
n. 

1. Thermodynamics a device, including a relay actuated by thermal conduction or convection, that functions to establish and maintain a desired temperature automatically or signals a change in temperature for manual adjustment.

v.t. 

2. Thermodynamics to equip or control with a thermostat.

• thermo- + -stat 1825–35

ther′mo•stat′ic, adj. 
ther′mo•stat′i•cal•ly, adv.