noun, Oceanography, Geology.
an opening on the floor of the sea from which hot, mineral-rich solutions issue.
Compare 1 (def 2).
A fissure on the floor of a sea out of which flows water that has been heated by underlying magma. The water can be as hot as 400°C (752°F) and usually contains dissolved minerals that precipitate out of it upon contact with the colder seawater, building a stack of minerals, or chimney. Hydrothermal vents form an ecosystem for microbes and animals, such as tubeworms, giant clams, and blind shrimp, that can withstand the hostile environment. ◇ The hottest hydrothermal vents are called black smokers because they spew iron and sulfide which combine to form iron monosulfide, a black compound.
hydrothionemia hy·dro·thi·o·ne·mi·a (hī’drō-thī’ə-nē’mē-ə) n. The presence of hydrogen sulfide in the blood.
hydrothionuria hy·dro·thi·o·nu·ri·a (hī’drō-thī’ə-nur’ē-ə, -nyur’-) n. The presence of hydrogen sulfide in the urine.
[hahy-druh-thawr-aks, -thohr-] /ˌhaɪ drəˈθɔr æks, -ˈθoʊr-/ noun, Pathology. 1. the presence of serous fluid in one or both pleural cavities. /ˌhaɪdrəʊˈθɔːræks/ noun 1. (pathol) an accumulation of fluid in one or both pleural cavities, often resulting from disease of the heart or kidneys hydrothorax hy·dro·tho·rax (hī’drə-thôr’āks’) n. The accumulation of serous fluid in one or […]
[hahy-druh-trop-ik, -troh-pik] /ˌhaɪ drəˈtrɒp ɪk, -ˈtroʊ pɪk/ adjective 1. Biology. turning or tending in a particular direction with reference to moisture. hydrotropism (hī-drŏt’rə-pĭz’əm) The growth or movement of a fixed organism, especially a plant, or a part of an organism toward or away from water. Roots often display hydrotropism in growing towards a water source. […]