hydro-, hydra-, hydr-, hyd-

1. The process of removing water from a substance or compound.
2. The process of removing water from a food product in order to preserve it or to make it more portable.
3. Excessive loss of water from the body or from an organ or body part, as a result of illness or fluid deprivation.

A condition in which there is an excessive loss of water from the body tissues, caused by such factors as prolonged diarrhea or fever, repeated vomiting, and excessive perspiration or urination. Extreme dehydration may lead to shock or even death.

In hydrology, the study of tree-ring configuration to determine hydrologic occurrences; variations in the width reveal variations in precipitation or water flow.

A variety of chalcedony containing water.

Chalcedony; calcedony: A translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands.

Certain crystals that have water within; containing fluid drops.

The normal state of hydration.

The existence of a form of life that thrives submerged in fresh water: Euhydrophily can be exemplified by the growth of the water lily in a pond or small lake.

The condition of euhydrophily can also include plants whose flowers and seeds on short stems are above the surface of the water.

Normally submerged and floating aquatic plants.

Excretion into the stomach of a large amount of watery fluid containing neither hydrochloric acid, chymosin nor pepsin ferments.

The scientific study of subsurface water; hydrogeology: Geohydrology especially pertains to the study of the geologic settings of underground water.

Geohydrology is the branch of geology that studies the movement of subsurface water through rocks and the effect of moving water on rocks, including their erosion.

The term geohydrology is often used interchangeably with "hydrogeology". Some make the minor distinction between hydrologists or engineers who are applying themselves to geology (geohydrology), and geologists applying themselves to "hydrology" (hydrogeology).

Plants that grow part of the time in water and other times in non-aquatic soil.

Belonging to the Hydradephaga or aquatic carnivorous beetles.

In medicine, regarding something that has the property of removing accumulations of water or serum, or of causing watery evacuations: Jim had to drink a hydragogic liquid prescribed by his doctor to reduce or even eliminate the bladder pains he was having.

An agent or substance that produces a discharge of watery fluid: A hydragogue can be of a cathartic nature and aids in the removal of edematous fluids such as saline cathartics.

Hydragogues can cause watery discharge, especially watery stools.

A “salt-water lizard” from Late Triassic period and found in southern Germany. Named by German paleontologist Friedrich von Huene in 1908.

The congenital absence of the cerebral hemispheres in which the space in the cranium that they normally occupy is filled with fluid.

This is a condition in which the cerebral hemispheres are absent and replaced by sacs filled with cerebrospinal fluid. Usually the cerebellum and brainstem are formed normally.

An infant with hydranencephaly may appear normal at birth. The infant's head size and spontaneous reflexes; such as, sucking, swallowing, crying, and moving the arms and legs may all seem normal; however, after a few weeks the child usually becomes irritable and has increased muscle tone (hypertonia or increased rigidity, tension, and spasticity of the muscles).

After several months of life, seizures and hydrocephalus may develop. Other symptoms may include visual impairment, lack of growth, deafness, blindness, spastic quadriparesis (paralysis), and intellectual deficits.