Dictionary entry

Thermostat

Webster's Dictionary 1913

Ther″mo‐stat (?), n. [Thermo- + Gr. � to make to stand.] (Physics) 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.