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hydrology the scientific study of the distribution, circulation, and quality of the waters of the earth.
hydrolysis the decomposing of a chemical compound by combining it with water or the elements of water.
hydrolyte a substance that has gone through the process of hydrolysis.
hydrolyze to subject to or undergo hydrolysis.
hydrometer an instrument, usu. a sealed glass tube containing a graduated scale and weighted at one end, used to measure the specific gravity of liquids.
hydropathy the treatment of disease by the use of water, as by drinking or external application. (Cf. hydrotherapy.)
hydrophilic of or pertaining to a substance that has a strong affinity for water.
hydrophobia abnormal fear of water. [2 definitions]
hydrophobic having a fear of water. [2 definitions]
hydrophyte a plant that grows in water alone or in esp. wet ground.
hydroplane a light, fast motorboat that at high speeds skims the water with only the rear part of the hull touching the surface. [5 definitions]
hydroponics (used with a sing. verb) the growing of plants in nutrient solutions rather than in soil.
hydropower electrical energy from hydroelectric generating plants.
hydrosphere collectively, all bodies and forms of water on or around the earth's surface, including vapor and clouds in the atmosphere.
hydrostatics (used with a sing. verb) the scientific study of liquids at rest, esp. with regard to pressure and equilibrium.
hydrotherapeutics (used with a sing. verb) the practice or process of hydrotherapy.
hydrotherapy the treatment of disease through the internal or external application of water.
hydrotropism movement or growth, as by an organism or plant root, either toward or away from water.
hydrous containing water or its elements, esp. in a chemical union.
hydroxide a chemical compound that contains ions made up of one atom of hydrogen and one atom of oxygen.
hydroxyapatite a calcium mineral that is an important component of bone and dental enamel in humans and other animals.