Root words for thermo that is not thermos?

You're right, "thermos" is a specific product and not a root word. The root word for "thermo-" is thermo, which comes from the Greek word "therme" meaning "heat."

Here are some examples of words using the root "thermo":

* Thermodynamics: The branch of physics that deals with heat and its relation to other forms of energy.

* Thermometer: A device that measures temperature.

* Thermocouple: A device that converts temperature into an electrical signal.

* Thermal: Relating to heat.

* Thermostat: A device that regulates temperature.

* Thermotherapy: The use of heat in medical treatment.

Let me know if you'd like to explore more words with the "thermo" root!