• synonyms


  1. 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.
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verb (used with object), ther·mo·stat·ted or ther·mo·stat·ed; ther·mo·stat·ting or ther·mo·stat·ing.
  1. to equip or control with a thermostat.
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Origin of thermostat

First recorded in 1825–35; thermo- + -stat
Related formsther·mo·stat·ic, adjectivether·mo·stat·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for thermostatic

Historical Examples of thermostatic

  • The automatic iron has what is called a thermostatic control which holds the temperature of the iron at the heat you want.

    Electricity for the 4-H Scientist

    Eric B. Wilson

  • This is accomplished by means of a thermostatic bar made of plates of brass and vulcanite fastened together.

  • Fig. 69 shows a thermostatic control valve attached to the bottom of a heater coil, and at the side of storage tank.

  • It probably wouldn't be noticed that the torn and blood-spattered clothes on the corpse were not thermostatic.

    The Standardized Man

    Stephen Bartholomew

British Dictionary definitions for thermostatic


  1. a device that maintains a system at a constant temperature. It often consists of a bimetallic strip that bends as it expands and contracts with temperature, thus breaking and making contact with an electrical power supply
  2. a similar device that actuates equipment, such as a sprinkler, when a certain temperature is reached
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Derived Formsthermostatic, adjectivethermostatically, adverb
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

Word Origin and History for thermostatic



1831, from thermo- + -stat.

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Online Etymology Dictionary, © 2010 Douglas Harper

thermostatic in Science


  1. A device that automatically controls heating or cooling equipment in such a way as to maintain a temperature at a constant level or within a specified range, generally using a thermometer capable of triggering electrical switches that activate or deactivate the equipment.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

thermostatic in Culture


A device that monitors and automatically responds to changes in temperature and activates switches controlling devices such as furnaces or air conditioners.

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.