| hydrogen | hydrogène |
| Hydrogen bond | Liaison hydrogène |
| Hydrogen bridge | Liaison hydrogène |
| Hydrogen bridge bond | Liaison hydrogène |
| Hydrogen bridge linkage | Liaison hydrogène |
| Hydrogen cyanide | Cyanure d'hydrogène |
| Hydrogen deficient stars | Etoile deficiente en hydrogen |
| Hydrogen economy | Économie hydrogène |
| Hydrogen halide | Acide halohydrique |
| hydrogen peroxide | eau oxygénée |
| hydrogen sulphide | sulfure d'hydrogène |
| Hydrogen vehicle | Moteur à hydrogène |
| hydrogeology | hydrogéologie |
| hydrographic basin | bassin hydrographique |
| hydrographic network | réseau hydrographique |
| hydrography | hydrographie |
| Hydrohalogenation | Addition électrophile |
| Hydrolase | Hydrolase |
| hydrologic balance | bilan hydrologique |
| hydrologic cycle | cycle de l'eau |
| hydrologic disaster | catastrophe hydrologique |
| hydrologic flow | régime hydrologique |
| Hydrological year | Année hydrologique |
| hydrology | hydrologie |
| hydrolysis | hydrolyse |
| Hydrolytic | Hydrolyse |
| Hydromagnetic waves | Onde hydromagnetique |
| Hydromagnetics | Hydromagnetisme |
| Hydromedusa | Hydromedusinae |
| Hydrometallurgy | Hydrométallurgie |
| hydrometeorology | hydrométéorologie |
| hydrometry | hydrométrie |
| Hydronium | Hydronium |
| Hydropathic establishment | Établissement hydrothérapique |
| Hydrophile | Composé hydrophile |
| Hydrophilia | Composé hydrophile |
| Hydrophilidae | Hydrophilidae |
| Hydrophis belcheri | Hydrophis belcheri |
| Hydrophobe | Hydrophobe |
| Hydrophyllaceae | Hydrophyllaceae |
| Hydropneumatic suspension | Suspension hydropneumatique |
| hydroponics | culture hydroponique |
| Hydropower station | Énergie hydroélectrique |
| Hydroseeding | Ensemencement hydraulique |
| hydrosphere | hydrosphère |
| Hydrostatic equilibrium | Équilibre hydrostatique |
| Hydrostatic pressure testing | Presser la détente |
| hydrostatics | hydrostatique |
| hydrotherapy | hydrothérapie |
| Hydrothermal synthesis | Cristallogénèse |
| Hydrothermal vent | Mont hydrothermal |
| hydroxide | hydrate |
