thermo-, therm-, thermi-, -thermia, -therm, -thermal, -thermic, -thermias, -thermies, -thermous, -thermy
(Greek: heat, heating, heater, hot, warm)
The term heat is employed in ordinary language in different senses. Some scientists distinguish four principal applications of the term:
- Sensation of heat.
- Temperature, or degree of hotness.
- Quantity of thermal energy.
- Radiant heat, or energy of radiation.
2. The sense by which differences of temperature are distinguished by thermoreceptors or bodily sense receptors that respond to stimulations of heat and cold temperatures.
3. The capability of perceiving cold and warmth, and so being aware of the differences in the temperatures of external objects.
2. The discharge of electrons or ions from a solid or liquid as a result of its thermal energy.
3. The release of electrons when a material is heated; for example, electron emission when the tungsten cathode filament of a radiographic tube is heated to incandescence (emission of light by an object as a result of its being heated to a high temperature) by means of its low-voltage heating circuit.
2. Easily stained with warm acid dyes.
As a fever indicates that the body is fighting infection, pain has its purpose in reporting injury or internal problems. Unfortunately, pain is not a reliable indicator, and it is of limited help to a physician in forming an accurate diagnosis.
The perception of a pain’s very source may be incorrect. The tooth that one points out as the one that hurts may not be the one that’s abscessed.
That pain in a person’s arm may not be caused by a strain or injury to that area, but it could be the result of a problem in his/her heart or other organ.
These are examples of a phenomenon known as "referred pain".
2. Absence of pain when heat is applied.
2. Used in metallurgy, specifically, a test used to determine metal transformations based on the temperatures at which thermal arrests occur.

Related "heat, hot" word units: ferv-; pyreto-.
Related "bubble" word unit: ebulli-.