Isothermal rhymes with:
geothermal, hydrothermal, thermal, bermel, dermal, endodermal, epidermal, geothermal, hydrothermal, kurmel, mesodermal, thermal, turmel
geothermal, hydrothermal, thermal, bermel, dermal, endodermal, epidermal, geothermal, hydrothermal, kurmel, mesodermal, thermal, turmel