Nethermost :: Nethermost (a.) Lowest; as, the nethermost abyss..
Thermostat :: Thermostat (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..
Thermostatic :: Thermostatic (a.) Of or pertaining to the thermostat; made or effected by means of the thermostat.
Weathermost :: Weathermost (a.) Being farthest to the windward.