hydro-, hydra-, hydr-, hyd-

(Greek: water)

hydronephrosis
The accumulation of urine in and distension of the renal pelvis and calyces due to obstructed out-flow.
hydronomy, hydronomous
A system of river-names.
hydronym, hydronyms
A name of a body of water or rivers, lakes, and oceanic elements.
hydronymy
Proper names of bodies of water.

Hydronymy is the study of hydronyms and of how bodies of water receive their names and how they are transmitted through history. It can apply to rivers, lakes, even oceanic elements.

hydropathist
One who specializes in the use of water to treat and cure diseases.
hydropathology
The system of using water to treat and cure diseases.
hydropathy
The use of water to treat and cure diseases.
hydropedesis
Excessive sweating as in hyperhidrosis.
hydropenia
1. A condition marked by an inadequate amount of water.
2. A situation in which there is water deficiency or a lack of water in body tissues.
hydropenic
A reduction or deprivation of water.
Hydrophid (s) (noun), Hydrophids (pl)
Any sea snake of the genus "Hydrophys": The Hydrophids are venomous or poisonous, live by eating fishes, and have a flattened tails for swimming.
hydrophilic
In chemistry, having an affinity for the absorption of water.
hydrophilous
1. Thriving in wet or aquatic habitats.
2. Pollinated by waterborne pollen.
3. Having an affinity for water; readily absorbing or dissolving in water.
hydrophobe
A person who is afraid of water because of a perceived danger of drowning.
hydrophobia (s) (noun), hydrophobias (pl)
1. An peculiar condition which consists of an abnormal fear of water by those who have rabies: Sometimes hydrophobia involves the inability to drink or swallow liquids because of throat constrictions, not a revulsion of the drink itself, which gives the impression that the victims of lyssa are afraid of liquids.

This case of hydrophobia results in a symptom of intense excitement with terror and extreme thirst, but every effort to drink is immediately followed by choking and dyspnea (breathing difficulties) with an elevation of temperature and an increase of the pulse or heart beat.

2. A morbid aversion to water, especially since one could drown in it: Some people who have hydrophobia never go swimming in a pool or even bathe in a bathtub because of the abnormal fear that they will suffocate and die in the water.
An abnormal dread of water.
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A morbid fear of being in water.
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Cross references of word families that refer to "water": aqua-; hydat-; hygro-.