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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.
hydroxyl of a chemical group containing one atom each of hydrogen and oxygen, found in some bases, acids, and alcohols.
hydrozoan of or relating to any member of a group of water animals having a single internal cavity and tentacles on the oral end. [2 definitions]
hyena any of several carnivorous, mostly nocturnal, doglike mammals of Africa and Asia that have strong jaws and fairly small hindquarters.
Hygeia in Greek mythology, the goddess personifying health.
hygiene the science concerned with promoting health and preventing illness. [2 definitions]
hygienic of health or hygiene, or contributing to health or sanitation.
hygienics see hygiene.
hygienist a person skilled in any of various areas of hygiene, esp. a dentist's assistant.
hygro- moisture; humidity.
hygrometer any of several instruments that measure the amount of moisture in the air.
hygroscope an instrument that indicates humidity changes in the air.
hygroscopic attracting or easily absorbing atmospheric moisture.