difference - a disagreement or argument about some thing vital; "he had a dispute together with his wife"; "there have been irreconcilable differences"; "the familiar conflict between Republicans and Democrats" dermal ectodermal endodermal epidermal epithermal geothermal hydrothermal intradermal isothermal mesodermal photothermal electrothermal See All Rhymes for thermal Radiation is https://mpi-thermal.com