Bible Dictionaries
Thermostat

Webster's Dictionary

(n.) A self-acting apparatus for regulating temperature by the unequal expansion of different metals, liquids, or gases by heat, as in opening or closing the damper of a stove, or the like, as the heat becomes greater or less than is desired.

Bibliography Information
Webster, Noah. Entry for 'Thermostat'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/thermostat.html. 1828.