hydro-, hydra-, hydr-, hyd-

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.

A plant or animal that thrives in badlands: There are many animals that live in arid or semi-arid areas with scanty vegetation and marked surface erosion, including chuckwallas, lizards, jackrabbits, and rattlesnakes.

Many tortoises and birds are also hydrotribophiles that exist in 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.

The growth or directional response or turning 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, Cœlenterata: The Hydrozoa make up one of two main subdivisions of the subkingdom, Actinozoa, and include various simple and compound polyps and jellyfishes having no "stomodeum" or gastric tentacles.

Any freshwater or marine coelenterate of the class Hydrozoa: The hydrozoans include the 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.

1. The study of the interaction of magnetic fields and electrically conducting liquids or gases; such as, molten metal or plasma.
2. A theoretical procedure that would drive warships and submarines in seawater by having the water enter a cylindrical duct running through the hull and the interaction between a vertical magnetic field and an electric current passing horizontally through the water in the duct which pushes the water out of the stern, generating thrust.

The branch of hydrography that deals with the relation of mountains to drainage and to water sheds.