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Humus (plant, animal, material)
Huntington's disease (disease)
Hurricane (in meteorology)
Huygens' principle (principle)
Hybrid dysgenesis (genetics)
Hydrate (in chemistry)
Hydraulic valve lifter (mechanical engineering)
Hydraulics (branch of engineering)
Hydrazine (in chemistry)
Hydrido complexes (inorganic chemistry)
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Hydroelectric generator (electrical engineering)
Hydrogen (element)
Hydrogen bomb (weapon)
Hydrogen fluoride (in chemistry)
Hydrogen ion (inorganic chemistry)
Hydrogen peroxide (in chemistry)
Hydrogenation (process)
Hydrology (in science)
Hydrometer (mechanical device)
Hydrophone (mechanical device)
Hydroponics (in agriculture)
Hydrothermal vent (in Oceanography)
Hydroxide (in chemistry)
Hyena (mammal, carnivore)
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