| Isotherme | isotherm |
| isotherm | isothermic |
| Isomerie | isomerism |
| Geothermie | geothermal power geothermy |
| anotherm | anothermal |
| exotherm | exothermic |
| Therme | thermal bath thermal spring |
| Isohypse | contour |
| Isometrie | isometry |
| Isotropie | isotropy |
| isoliert | transient |
| Isobare | isobar |
| Isochrone | isochrone |
| Isomer | isomer |
| isochor | isochoric isochore isochorically |
| isolieren | insulate isolate |
| isotrop | isotropic |
| Lesother | Lesothan |
| Lesotherin | Lesothan |
| Esoterik | esotericism |