[hahy-druh-nawt, -not] /ˈhaɪ drəˌnɔt, -ˌnɒt/
a person trained to work in deep-sea vessels for research and rescue purposes.
(US, navy) a person trained to operate deep submergence vessels
[hahy-droh-nuh-froh-sis] /ˌhaɪ droʊ nəˈfroʊ sɪs/ noun, Pathology. 1. dilation of the branches and pelvic cavity of the kidney, caused by an accumulation of urine resulting from obstruction of normal outflow. hydronephrosis hy·dro·ne·phro·sis (hī’drō-nə-frō’sĭs) n. The dilation of the pelvis and calices of one or both kidneys because of the accumulation of urine resulting from obstruction […]
[hahy-dron-ik] /haɪˈdrɒn ɪk/ adjective 1. 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