| hydropathic | (adjective) of or relating to hydropathy or its administration | - |
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| hydropathy | (noun) the internal and external use of water in the treatment of disease | Synonyms: hydrotherapy |
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| hydrophilic | (adjective) having a strong affinity for water; tending to dissolve in, mix with, or be wetted by water | - |
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| hydrophobia | (noun) an acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain | Synonyms: lyssa, madness, rabies |
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| (noun) a morbid fear of water | - |
| (noun) a symptom of rabies in humans consisting of an aversion to swallowing liquids | - |
| hydrophobic | (adjective) lacking affinity for water; tending to repel and not absorb water; tending not to dissolve in or mix with or be wetted by water | - |
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| (adjective) abnormally afraid of water | Synonyms: aquaphobic |
| hydrophobicity | (noun) the property of being water-repellent; tending to repel and not absorb water | - |
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| hydrophyte | (noun) a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth | Synonyms: aquatic plant, hydrophytic plant, water plant |
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| hydrophytic | (adjective) growing wholly or partially in water | - |
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| hydroplane | (noun) an airplane that can land on or take off from water | Synonyms: seaplane |
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| (noun) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds | Synonyms: hydrofoil |
| (verb) glide on the water in a hydroplane | Synonyms: seaplane |
| hydroponic | (adjective) of or relating to aquiculture | Synonyms: aquacultural, aquicultural |
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| hydroponics | (noun) a technique of growing plants (without soil) in water containing dissolved nutrients | Synonyms: aquiculture, tank farming |
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| hydrops | (noun) swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities | Synonyms: dropsy, edema, oedema |
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| hydrosol | (noun) a sol (colloid) in which the continuous phase is water. | - |
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| hydrosphere | (noun) the watery layer of the earth's surface; includes water vapor | - |
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| hydrostatic | (adjective) relating to fluids at rest or to the pressures they exert or transmit | - |
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| 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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| pachyderm | (noun) any of various nonruminant hoofed mammals having very thick skin: elephant, rhinoceros, hippopotamus | - |
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| pachyderma | (noun) thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction | Synonyms: nevoid elephantiasis |
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| pachydermal | (adjective) of or relating to or characteristic of pachyderms | Synonyms: pachydermatous, pachydermic, pachydermous |
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| pachydermatous | (adjective) of or relating to or characteristic of pachyderms | Synonyms: pachydermal, pachydermic, pachydermous |
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| (adjective) emotionally hardened | Synonyms: callous, indurate |
| pachydermic | (adjective) of or relating to or characteristic of pachyderms | Synonyms: pachydermal, pachydermatous, pachydermous |
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| pachydermous | (adjective) of or relating to or characteristic of pachyderms | Synonyms: pachydermal, pachydermatous, pachydermic |
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| paraldehyde | (noun) a colorless liquid (a cyclic trimer of acetaldehyde) that is used as a sedative and a solvent | Synonyms: ethanal trimer |
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| propionaldehyde | (noun) a colorless liquid aldehyde | Synonyms: propanal |
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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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| whydah | (noun) mostly black African weaverbird | Synonyms: whidah, widow bird |
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