| Hydrocephalus | hydrocephalus |
| Hydrozephalus | hydrocephalus |
| Hydrosphäre | hydrosphere |
| hydrophil | hydrophilic |
| Hydrochemie | hydrochemistry |
| Hydrochinon | hydroquinone |
| Hydrogenase | hydrogenase |
| Hydrochorie | hydrochory |
| Hydrogenium | hydrogen |
| hydrophob | hydrophobic |
| Brockhaus | encyclopaedia |
| Trochäus | trochee |
| Makrozephalie | macrocephaly |
| Hydrocortison | hydrocortisone |
| Hydrodynamik | hydrodynamics |
| Hydroenergie | hydropower |
| Hydrogen | hydrogen |
| Hydrogeochemie | hydrogeochemistry |
| Hydrographie | hydrography |
| Hydrokultur | hydroponics |