hydro-, hydra-, hydr-, hyd-

(Greek: water)

1. Someone who is skilled in hydrography.
2. A specialist who surveys, or draws maps or charts of, the sea, lakes, or other waters, with the adjacent shores; and who describes the sea or other waters.
1. The scientific description and analysis of the physical conditions, boundaries, flow, and related characteristics of the earth's surface waters.
2. The mapping of bodies of water.
1. The science which has for its object the description of the waters of the earth’s surface, the sea, lakes, rivers, etc., comprising the study and mapping of their forms and physical features, of the contour of the sea-bottom, shallows, etc., and of winds, tides, currents, and the like.

In earlier use, including the principles of Navigation. Also a treatise on this science, a scientific description of the waters of the earth.

2. The subject-matter of this science; the hydrographical features of the globe or part of it; the distribution of water on the earth’s surface.
3. The scientific description and analysis of the physical conditions, boundaries, flow, and related characteristics of the earth's surface waters.
4. The mapping of bodies of water.
hydrogymnasium (s) (noun), hydrogymnasia (pl)
A therapeutic pool or special physical treatment or exercises that are done in a swimming pool or a special pool of water: Mrs. Smith had such bad back problems that her doctor told her to participate in a swimming class at the hydrogymnasium where the swimming teachers could help her train in water so she could recover from her aching back.
hydrogymnastic (adjective), more hydrogymnastic, most hydrogymnastic
Relating to exercises done in the water; such as, in a swimming pool: The hydrogymnastic training helped Linda improve the use of the muscles in her previously broken arm.
hydrogymnastics (pl) (noun) (plural used as a singular)
Therapeutic movements performed while immersed in water: The hydrogymnastics the physiotherapist showed Monroe were to be done as a regular exercise every day.
An aquatic hemicryptophyte (a herbaceous plant which has its wintering buds at or just above the water surface).
1. Related to, or resembling, the hydra; of or pertaining to the Hydroidea.
2. That form of hydrozoan that is asexual and grows into branching colonies by budding.
The study of the motion of a liquid apart from the cause of motion.
hydrokinesia, hydrokinesis
The purported psychic ability to mentally manipulate water in its solid, liquid, and gaseous states.
The therapeutic use of exercises performed while the patient is immersed in water.
1. Of or relating to hydrokinetics; to fluids in motion or the forces that produce or affect such motion.
2. Of or relating to the kinetic energy and motion of fluids.
3. The use of moving water or other fluid for therapeutic purposes, as in hydromassage.
hydrokinetics, hydrokinetically
1. The branch of physics concerned with the scientific study of the properties and behavior of fluids in motion.
2. That branch of kinetics concerned with fluids in motion.
3. The branch of hydrodynamics that deals with the laws governing liquids or gases in motion.
4. The study of water in motion and its therapeutic applications.
Marked by a tendency to experience alteration in water content.
Primitive worship of water.

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