Etymology
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thermostat (n.)

automatic instrument for regulating temperature, 1831, from thermo- + -stat.

updated on January 28, 2014

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Definitions of thermostat from WordNet
1
thermostat (v.)
control the temperature with a thermostat;
2
thermostat (n.)
a regulator for automatically regulating temperature by starting or stopping the supply of heat;
Synonyms: thermoregulator
From wordnet.princeton.edu, not affiliated with etymonline.