hydro-, hydra-, hydr-, hyd- +

Thriving in water and wind; a reference to plants that discharge air-borne spores after getting wet and producing structures.

Measurement of the depths in the sea based on hydrostatic pressure.

1. The study of life, or living organisms, in aquatic habitats.
2. The study of live forms in bodies of water; such as, lakes or estuaries.

An organism living mainly in water.

The sum total of all aquatic life; that part of the earth’s surface occupied by aquatic organisms.

The development of living organisms, as bacteria, in fluid media; the conditions of life of such organisms; fluid media.

A watery swelling of the eyelid.

Aquatic plants having flowers which are fertilized out of the water but submerged for development of fruit.

An accumulation of serous fluid in a body cavity; especially, between the visceral and parietal layers of the tunica vaginalis in the scrotum.

The surgical process of removing a hydrocele (the accumulation of fluid in the coat around the testis).

Small hydroceles tend to disappear by one year of age while larger hydroceles may persist and warrant surgery.

A procedure by which an abnormal serous fluid accumulation is drained from the body.

Describing, pertaining to, or affected by hydrocephalus.

Resembling hydrocephalus because of an apparently enlarged cranium which is seen in some cases of starvation, but without any abnormal accumulation of cerebrospinal fluid.

1. A congenital condition in which an abnormal accumulation of fluid in the cerebral ventricles causes enlargement of the skull and compression of the brain, destroying much of the neural tissue.
2. An accumulation of serous fluid within the cranium: especially, in infancy, due to obstruction of the movement of cerebrospinal fluid, often causing great enlargement of the head; "water on the brain".

A condition marked by dilatation of the cerebral ventricles, most often occurring secondarily to obstruction of the cerebrospinal fluid pathways and accompanied by an accumulation of cerebrospinal fluid within the skull, the fluid is usually under increased pressure, but occasionally may be normal or nearly so.

It is typically characterised by enlargement of the head, prominence of the forehead, brain atrophy, mental deterioration and convulsions, may be congenital or acquired, and may be of sudden onset (acute hydrocephalus) or be slowly progressive (chronic hydrocephalus.

1. An abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological.
2. An increased quantity of cerebrospinal fluid (CSF) inside the brain that can result in increased pressure.

It is often the result of a disturbance (obstruction) in the normal cerebrospinal fluid (CSF) circulation or the over-production of CSF.

The diagnostic signs and symptoms of hydrocephalus depend upon the age of the person:

1. In infants the most obvious sign of hydrocephalus is usually an abnormally large head. (That is one reason a baby's head should be measured at every well-baby visit). Symptoms of hydrocephalus in an infant may include vomiting, sleepiness, irritability, an inability to look upwards, and seizures.
2. In older children and adults there is no head enlargement from hydrocephalus, but symptoms may include headache, nausea, vomiting and, sometimes, blurred vision. There may be problems with balance, delayed development in walking or talking, and poor coordination.