hydro-, hydra-, hydr-, hyd-

(Greek: water)

1. The water portion of the earth or biosphere; as distinguished from the solid part (lithosphere) and from the gaseous outer envelope (atmosphere).
2. The portion of the earth that is water, including liquid water, ice, and water vapor on the surface, underground, or in the atmosphere.
hydrosphygmography (s) (noun), hydrosphygmographies (pl)
1. A recording of blood pressure by means of a hydrosphygmograph using water as an index.
2. A sphygmograph in which the pulse beat is transmitted to the recorder through a column of water.

A sphygmograph is an instrument which, when applied over an artery, indicates graphically the movements or character of the pulse.

hydrostat (s) (noun), hydrostats (pl)
1. An electrical device designed to indicate or regulate the height of fluid in a column, reservoir, or other container: The hydrostat Jim was using was a good protection against the destruction of his building from leakage or flooding.
2. An apparatus that is used to prevent damage to a steam boiler when the water gets below a specified level: The hydrostat that Susan had on her pressure cooker gave a signal as a warning when the amount of water got too low.
1. The science of pressures and levels in water and hence in liquids generally.
2. The study of liquids at rest and the forces exerted on them or by them.
3. The study of liquids at rest as well as the forces and pressures associated with them.
hydrosudopathy (s) (noun), hydrosudopathies (pl)
A therapy using hydrotherapy integrated with induced sweating: Norman found out that the method of hydrosudopathy could help his ailment and so he went to a Turkish bath!
Hydrotherapy combined with induced sweating as in a Turkish bath, sauna, etc.; also hidrotherapy.
hydrotaxis, hydrotactic
1. The directed response of a motile organism towards (positive) or away from (negative) a water or moisture stimulus.
2. Movement of an organism in response to water.
3. A movement or orientation directed by the presence of water.
hydrotechnic, hydrotechny
Relating to or dealing with the technical management or utilization of water.
1. Death caused by drowning.
2. Execution or accidental death by drowning.
hydrotheology (s) (noun), hydrotheologies (pl)
1. A discourse on theology which is not founded on revelation, but is based on reasoning from natural facts concerning water.
2. Characterized by natural theology.
A reference to hydrotherapy or hydrotherapeutics.
A specialist in or practitioner of hydrotherapy.
hydrotherapy, hydrotherapeutics
1. Treatment of an illness with water by external application, either for its pressure effect or as a means of applying physical energy to the tissues.
2. The external application of water; such as, in warm baths to relax or with cold compresses to reduce fevers.
hydrothermal vent (s) (noun), hydrothermal vents (pl)
1. A fissure in the sea bottom through which hot aqueous solutions rise from the magma beneath the crust; a hot spring: Hydrothermal vents are located on the seabed mainly along the central axes of the ridges in mid-ocean.
2. A geyser on the sea bottom through which super-hot aqueous solutions rise from the magma beneath the earth's crust: The hydrothermal vents create 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.

hydrothermal, hydrothermia, hydrothermally
1. A reference to heated water, to its action, or to the products of such action.
2. Applied to the action of heated water in bringing about changes in the earth's crust.
3. A reference to hot water on or beneath the surface of the earth.
4. Relating to hot water, especially to naturally occurring hot water in thermal springs.
5. Relating to or caused by heated water; especially, the action of water heated by natural processes rather than by industrial activity.

Cross references of word families that refer to "water": aqua-; hydat-; hygro-.