[hahy-droh-nee-uh m] /haɪˈdroʊ ni əm/
the hydrogen ion bonded to a molecule of water, H 3 O + , the form in which hydrogen ions are found in aqueous solution.
(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
hydropericarditis hy·dro·per·i·car·di·tis (hī’drō-pěr’ĭ-kär-dī’tĭs) n. Pericarditis accompanied by an effusion of serous fluid into the pericardial cavity.
hydropericardium hy·dro·per·i·car·di·um (hī’drō-pěr’ĭ-kär’dē-əm) n. The noninflammatory accumulation of watery fluid in the pericardial cavity.