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naevus

A type of skin blemish.

NAI

non-accidental injury

nanoparticle

A microscopic particle of matter that is measured on the nanoscale, usually one that measures less than 100 nanometers.

narcolepsy

A sleep disorder in which there are episodes of temporary cessation of breathing (lasting 10 seconds or longer) during sleep

narcolepsy

A sleep disorder characterised by chronic daytime sleepiness with recurrent episodes of sleep occuring throughout the day.

nasal

Relating to the nose

nasal polyp

A growth in the lining of the nose.

nasal septum

The partition that divides the nose cavity into two nostrils

nasogastric tube

A tube passed through the nose into the stomach.

nasopharynx

The passage connecting the nasal cavity behind the nose to the top of the throat.

NDE

Near-death experience.

near-death experience

A set of perceptions often experienced by those near to death, or who have died clinically and are subsequently revived. Frequent features are a sense of detachment from the body, sometimes levitating out of it, seeing a tunnel of light and usually feelings of serenity (but occasionally terror).

neauraminidase inhibitors

A class of antiviral drugs that act against the influenza virus.

necrosis

Death of cells or tissue in the body due to disease, injury or impaired blood supply.

needle track seeding

A complication arising from a biopsy whereby the tumour cells are released into the surrounding tissues.

neglect

Lack of attention or disregard; a condition in which one side of the body or visual field are neglected.

neonatal

Relating to the newborn baby.

neonate

A newborn baby.

neoplasia

An abnormal proliferation of cells

neoplastic disease

Any malignant growth.

neovascularisation

The formation of new, abnormally fragile blood vessels.

nephrectomy

The surgical removal of a kidney.

nephritis

Inflammation of the kidney.

nephrogenic diabetes insipidus

A medical condition in which the kidney is unable to conserve water.