| hydrostaticity | (noun) The condition of relating to fluids, especially to the pressure that they exert or transmit. | - |
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| hydrostatics | (noun) study of the mechanical properties of fluids that are not in motion | - |
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| hydrotherapy | (noun) the internal and external use of water in the treatment of disease | Synonyms: hydropathy |
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| hydrothorax | (noun) accumulation of fluid in the pleural cavity (the space between the lungs and the walls of the chest) often resulting from disease of the heart or kidneys | - |
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| hydrous | (adjective) containing combined water (especially water of crystallization as in a hydrate) | Synonyms: hydrated |
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| hydroxide | (noun) a compound of an oxide with water | Synonyms: hydrated oxide |
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| (noun) a chemical compound containing the hydroxyl group | - |
| hydroxy | (adjective) being or containing a hydroxyl group | - |
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| hydroxybenzene | (noun) a toxic white soluble crystalline acidic derivative of benzene; used in manufacturing and as a disinfectant and antiseptic; poisonous if taken internally | Synonyms: carbolic acid, oxybenzene, phenol, phenylic acid |
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| hydroxychloroquine | (noun) anti-inflammatory drug (trade name Plaquenil) used in the treatment of rheumatoid arthritis and malaria and lupus erythematosus | Synonyms: Plaquenil |
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| hydroxyl | (noun) the monovalent group -OH in such compounds as bases and some acids and alcohols | Synonyms: hydroxyl group, hydroxyl radical |
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| hydroxymethyl | (noun) a methyl with hydroxide replacing the hydrogen atoms | - |
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| hydroxyproline | (noun) a crystalline amino acid obtained from gelatin or collagen | - |
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| hydroxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: oxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| hydroxyzine | (noun) a drug (trade names Atarax and Vistaril) used as a tranquilizer to treat anxiety and motion sickness | Synonyms: Atarax, hydroxyzine hydrochloride, Vistaril |
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| hydrozoan | (noun) colonial coelenterates having the polyp phase dominant | Synonyms: hydroid |
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| iodochlorhydroxyquin | (noun) drug used to treat certain fungal infection (as athlete's foot) | Synonyms: Clioquinol |
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| magnetohydrodynamics | (noun) the study of the interaction of magnetic fields and electrically conducting fluids (as plasma or molten metal) | - |
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| monohydrate | (noun) a hydrate that contains one molecule of water per molecule of the compound | - |
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| tetrahydrocannabinol | (noun) psychoactive substance present in marijuana | Synonyms: THC |
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| thermohydrometer | (noun) a hydrometer that includes a thermometer | Synonyms: thermogravimeter |
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| thermohydrometric | (adjective) of or relating to thermal hydrometry | Synonyms: thermogravimetric |
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| trihydroxy | (adjective) containing three hydroxyl groups | - |
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