| Hydrozephalus | hydrocephalus |
| Hydrocephalus | hydrocephalus |
| Hydrosphäre | hydrosphere |
| hydrophil | hydrophilic |
| Makrozephalie | macrocephaly |
| Hydrogenase | hydrogenase |
| Hydrogenium | hydrogen |
| hydrophob | hydrophobic |
| Autozephalie | autocephaly |
| autozephal | autocephalous autocephalic |
| Hydrochemie | hydrochemistry |
| Hydrochinon | hydroquinone |
| Hydrodynamik | hydrodynamics |
| Hydroenergie | hydropower |
| Hydrogen | hydrogen |
| Hydrogeochemie | hydrogeochemistry |
| Hydrographie | hydrography |
| Hydrokultur | hydroponics |
| Hydroxyl | hydroxyl |
| Hydrathülle | hydration shell |