| carbohydrate | (noun) an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain | Synonyms: saccharide, sugar |
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| clepsydra | (noun) clock that measures time by the escape of water | Synonyms: water clock, water glass |
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| dehydration | (noun) the process of extracting moisture | Synonyms: desiccation, drying up, evaporation |
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| (noun) dryness resulting from the removal of water | Synonyms: desiccation |
| (noun) depletion of bodily fluids | - |
| diphenhydramine | (noun) antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness | Synonyms: Benadryl |
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| hydra | (noun) small tubular solitary freshwater hydrozoan polyp | - |
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| (noun) trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality | - |
| hydralazine | (noun) an antihypertensive drug (trade name Apresoline) that dilates blood vessels; used (often with a diuretic) to treat hypertension and congestive heart failure | Synonyms: Apresoline |
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| hydramnios | (noun) an abnormality of pregnancy; accumulation of excess amniotic fluid | - |
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| hydrangea | (noun) any of various deciduous or evergreen shrubs of the genus Hydrangea | - |
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| hydrant | (noun) a discharge pipe with a valve and spout at which water may be drawn from the mains of waterworks | - |
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| (noun) a faucet for drawing water from a pipe or cask | Synonyms: tap, water faucet, water tap |
| hydrargyrum | (noun) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures | Synonyms: atomic number 80, Hg, mercury, quicksilver |
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| hydrarthrosis | (noun) inflammation and swelling of a movable joint because of excess synovial fluid | - |
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| hydrate | (noun) any compound that contains water of crystallization | - |
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| hydration | (noun) the process of combining with water; usually reversible | - |
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| hydraulics | (noun) study of the mechanics of fluids | Synonyms: fluid mechanics |
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| hydrazide | (noun) any of a class of organic compounds sharing a common functional group characterized by a nitrogen to nitrogen covalent bond with 4 substituents with at least one of them being an acyl group. | - |
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| hydrazine | (noun) a colorless fuming corrosive liquid; a powerful reducing agent; used chiefly in rocket fuels | - |
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| hydrazoite | (noun) a salt of hydrazoic acid | - |
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| monohydrate | (noun) a hydrate that contains one molecule of water per molecule of the compound | - |
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