as a noun for just a warm updraft, normally in excess of a plowed field or desert, that lifts their wings, just as it permits hawks to soar upward with no moving their wings. dermal ectodermal endodermal epidermal epithermal geothermal hydrothermal intradermal isothermal mesodermal photothermal electrothermal See All Rhymes https://mpi-thermal.com/blog/thermal-shock-vs-thermal-cycling-test/