| Hydrogenium | hydrogen |
| Hydrogen | hydrogen |
| Hydrogenase | hydrogenase |
| Hydronym | hydronym |
| Dehydrogenase | dehydrogenase |
| Hydrochemie | hydrochemistry |
| Hydroenergie | hydropower |
| Hydrokultur | hydroponics |
| Hydrologin | hydrologist |
| Hydrologie | hydrology |
| Hydrometer | hydrometer |
| Hydronymie | hydronymy |
| Hydroxid | hydroxide |
| Hydroxidion | hydroxide |
| hydrophil | hydrophilic |
| hydroponisch | hydroponic hydroponically soilless |
| Drogen- | narco- |
| Androeceum | androecium |
| Androgen | androgen |
| androgen | androgen |