hydro-, hydra-, hydr-, hyd-

Any of various shrubs of the genus Hydrangea, having opposite leaves and large, flat-topped or rounded clusters of white, pink, or blue flowers.

1. An upright pipe with a spout, nozzle, or other outlet, usually in the street, for drawing water from a main or service pipe; especially, for fighting fires.
2. A faucet for drawing water from a pipe.

1. A feeding zooid in a hydroid colony having an oral opening surrounded by tentacles.
2. The terminal part of a hydroid polyp that bears the mouth and tentacles and contains the stomach region.

A mental disorder due to mercury poisoning.

A strong aversion of mercurial medicines: Greg read in his biology book that hydrargyrophobia can be caused by a dread of using medicines containing mercury, such as mercury cyanide, because of the toxic effect when taken in larger doses.

Inflammation and swelling of a movable joint because of excess amount of synovial fluid or lubricating fluid: When Hank went to the doctor to see what was causing so much pain in his knee, he was told that he had hydrarthros or "water on the knee" also known as an excessive build-up of "water in the cavity".

1. A solid compound containing water molecules combined in a definite ratio as an integral part of the crystal.
2. To combine chemically with water.
3. To supply water to a person or thing in order to restore or to maintain fluid balance.

1. The act of combining or causing to combine with water.
2. The condition of being combined with water.

1. Operated by, moved by, or employing water or other liquids in motion.
2. Operated by the pressure created by forcing water, oil, or another liquid through a comparatively narrow pipe or orifice.
3. Of or pertaining to water or other liquids in motion.
4. A reference to hydraulics.
5. Hardening under water; such as, a cement.

In a hydraulic manner: "The block is then tested hydraulically to its full design test pressure on each stream separately."

1. A branch of science that deals with practical applications (as the transmission of energy or the effects of flow) of liquid (as water) in motion.
2. The physical science and technology of the static and dynamic behavior of fluids.
3. The science that deals with the laws governing water or other liquids in motion and their applications in engineering; practical or applied hydrodynamics.

1. A blood disorder in which there is excess fluid volume (of water) compared with the cell volume of the blood.
2. The excessive dilution of the blood, so that the proportion of serum to corpuscles is excessive.
3. A condition in which the blood volume is increased as a result of an increase in the water content of plasma, with or without a reduction in the concentration of protein; there is an excess of plasma in proportion to the cellular elements and a corresponding decrease in hematocrit (proportion of the blood that consists of packed red blood cells).
4. Excessive dilution of the blood, so that the proportion of serum to corpuscles is excessive; seen in splenomegaly (enlargement of the spleen) and other conditions.

A condition in which the blood volume is increased as a result of an increase in the water content of plasma, with or without a reduction in the concentration of protein; there is an excess of plasma in proportion to the cellular elements and a corresponding decrease in hematocrit (percentage of the volume of a blood sample occupied by cells).

An abnormally watery state of the blood.

1. A reference to the use of water to treat or cure disease.
2. The external or internal treatment with water

Characterized by, relating to, or requiring an abundance of moisture: A hydric habitat or place is where plants and animals live with sufficient water conditions as opposed to desert or dry areas.