therm=heat                                                                       
1.catatherma

Falling temperature or lowering of heat.    

2.diathermal

1. Heated by high-frequency electromagnetic radiation.
2. Freely permeable by radiant heat.

3.bathythermosphere

1. A device for obtaining a record of temperature against depth (pressure) in the ocean from a ship that is underway or in motion.
2. An instrument for recording water temperature as compared to depth.