[hahy-dron-ik] /haɪˈdrɒn ɪk/
of or relating to a heating system for a building in which the medium for carrying heat throughout the structure is circulating water, especially when the circulation is aided by a pump.
[hahy-druh-nahy-truh-juh n] /ˌhaɪ drəˈnaɪ trə dʒən/ noun 1. a chemical compound containing only hydrogen and .
[hahy-droh-nee-uh m] /haɪˈdroʊ ni əm/ noun 1. the hydrogen ion bonded to a molecule of water, H 3 O + , the form in which hydrogen ions are found in aqueous solution. /haɪˈdrəʊnɪəm/ noun 1. (chem) another name for hydroxonium ion
[hahy-druh-pak] /ˈhaɪ drəˌpæk/ noun 1. an urgent warning of navigational dangers in the Pacific Ocean, issued by the U.S. Navy Hydrographic Office.
[hahy-drop-uh-thee] /haɪˈdrɒp ə θi/ noun 1. the curing of disease by the internal and external use of water. /haɪˈdrɒpəθɪ/ noun 1. a pseudoscientific method of treating disease by the use of large quantities of water both internally and externally Also called water cure Compare hydrotherapy