endothermic

heated from within the body

exothermic

requires heat to be absorbed from outside the body

therm

a unit of heat that equals 1,000 calories

thermal

related to heat or temperature

thermodynamic

caused or operated by heat that has changed into different forms of energy

thermograph

a device that automatically writes down (records) changes in temperature

thermometer

an instrument that measures temperature or heat

thermophile

an organism that has adapted to living in very high temperatures (heat)

thermos

a container that is used to keep things warm

thermostat

a device used to control temperature