| Hydraulic machinery | Hydrauliek |
| Hydraulic rescue tools | Hydraulisch redgereedschap |
| Hydraulic turbine | Hydraulische turbine |
| Hydraulic-jet propulsion | Waterjet |
| Hydraulical | Waterbouwkundig |
| hydraulics | hydraulica |
| Hydria | Hydria |
| Hydrid | Hydride |
| Hydrino theory | Hydrino |
| Hydro energy | Waterkracht |
| Hydro power | Waterkracht |
| Hydro turbine | Hydraulische turbine |
| Hydro-electric power | Waterkracht |
| Hydro-Man | Hydro-Man |
| Hydro-power | Waterkracht |
| hydrocarbon | koolwaterstof |
| Hydrocharitaceae | Waterkaardefamilie |
| Hydrocharitales | Hydrocharitales |
| Hydrochlorous acid | Waterstofchloraat |
| Hydrocotyle | Waternavel |
| hydrodynamics | hydrodynamica |
| hydroelectric | hydro-elektrisch |
| Hydroelectric plant | Waterkracht |
| Hydroelectric power | Waterkracht |
| Hydroelectricity | Waterkracht |
| hydrofoil | draagvleugelboot |
| hydrogen | waterstof |
| Hydrogen bond | Waterstofbrug |
| Hydrogen bound | Waterstofbrug |
| Hydrogen bridge bond | Waterstofbrug |
| Hydrogen bridge linkage | Waterstofbrug |
| Hydrogen economy | Waterstofeconomie |
| hydrogen peroxide | waterstofperoxyde |
| Hydrogen production | Waterstofproductie |
| Hydrogen sulfide | Diwaterstofsulfide |
| Hydrogen technologies | Waterstoftechniek |
| Hydrogen vehicle | Waterstofauto |
| Hydrogenated peanut oil | Aardnootolie |
| Hydrogenosome | Hydrogenosoom |
| Hydrolaccolith | Pingo |
| Hydrolagus matallanasi | Draakvis |
| Hydrolase | Hydrolase |
| Hydrolisis | Hydrolyse |
| Hydrology | Hydrologie |
| Hydrolysis | Hydrolyse |
| Hydromedusa | Hydromedusa |
| Hydronium | Oxonium |
| Hydrophile | Hydrofiel |
| Hydrophilia | Hydrofiel |
| Hydrophilidae | Waterkevers |
| Hydrophis belcheri | Zeeslangen |
| Hydrophobe | Hydrofoob |
| hydrophobia | hondsdolheid |
| Hydrophyllaceae | Hydrophyllaceae |
| Hydropneumatic suspension | Hydropneumatisch |
| hydroponics | hydrocultuur |
| Hydropower station | Waterkracht |
| Hydrosphera | Hydrosfeer |
| Hydrosphere | Hydrosfeer |
| hydrostatics | hydrostatica |
