hydro-, hydra-, hydr-, hyd- +

1. A fissure in the sea bottom through which hot aqueous solutions rise from the magma beneath the crust.
2. A geyser on the sea bottom through which super-hot aqueous solutions rise from the magma beneath the earth's crust.

This creates a surrounding system of mineral-rich water which helps to support a distinctive type of ecosystem not found in typical cold-water environments at the same ocean depth.

A thermostat for regulating the temperature of water.

Hydrotherapy in which heated water is utilized as a treatment for physical ailments.

A “fisher lizard” from Late Cretaceous North America. Its name comes from Greek hydrotheras, “fisherman”. It was found in the Maastrichtian Moreno Formation, Panoche Hills, Fresno County, California. Named by U. S. paleontologist Samuel Paul Welles in 1943.

An apparatus for testing the hardness of water.

1. Measuring the hardness of water.
2. Determining the concentration of cations; such as, calcium and magnesium in water.

A procedure in which tissues are separated or dissected free by injecting water or other fluid under high pressure.

Thriving in badlands [an arid or semi-arid area with scanty vegetation and marked surface erosion; or an area of barren land having roughly eroded ridges, peaks, and mesas].

A badlands plant.

A compound that increases the aqueous solubility of various slightly soluble organic compounds.

1. The turning of a plant toward or away from water.
2. The growth or directional response of an organism toward or away from water or moisture.

1. The tendency of a substance only slightly soluble in water, to dissolve readily in other aqueous solutions.
2. The orientation response to water; such as, the tendency of an organism to orientate itself towards water or away for water.
3. The deviation response of parts of plants (especially, roots) towards moisture.

A methyl with hydroxide replacing the hydrogen atoms.

A class of coelenterates that includes various simple and compound polyps and jellyfishes having no stomodeum or gastric tentacles.

1. Any freshwater or marine coelenterate of the class Hydrozoa, including free-swimming or attached types, as the hydra, in which one developmental stage, either the polyp or medusa, is absent, and colonial types, as the Portuguese man-of-war, in which both medusa and polyp stages are present in a single colony.
2. Of, relating to, or belonging to the class Hydrozoa.