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Medical Dictionary Starting with N

N-Acetyl-Cysteine (NAC)

A form of the animo acid cysteine that is available as a nutritional supplement NAC is used to prevent liver damage due to acetaminophen overdose

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Nagana

An often fatal disease of African ungulates caused by various species of trypanosomes and transmitted by the bite of the tsetse fly Also called tsetse disease

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Nairobi Sheep Disease (NSD)

A noncontagious, tick-borne, viral infection of sheep and goats characterized by hemorrhagic gastroenteritis and high mortality

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Naive

Not previously exposed to therapy or treatment

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Narcolepsy

A disorder that causes excessive sleepiness during the day and frequent and uncontrollable episodes of falling asleep

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Narcosis

A drug (or other chemical)-induced drowsiness or stupor

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Narcotic

An addictive substance that blunts the senses; can cause confusion, stupor, coma, and death with increased dosages

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Narcotic Analgesics

A type of painkiller that blocks the transmission of pain signals in the brain; often cause tolerance and drug dependence

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Narcotics

An addictive drug, such as opium, that reduces pain, alters mood and behavior, and usually induces sleep or stupor Natural and synthetic narcotics are used in medicine to control pain

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Narcotism

A state of unnatural sleep, induced by the effect of narcotic substances

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Nasal Gleet

This is a chronic discharge from the nostrils of a horse of a whitish, muco-purulent matter

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Nasal Septum

Separates left and right nasal airway Includes the perpendicular plate of ethmoid, vomer, & cartilage

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Nasogastric Tube

A thin, plastic tube that is inserted through the nose, down the esophagus, and into the stomach; used to drain, wash, or take samples from the stomach, or to feed very sick patients who cannot eat

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Nasopharynx

The passageway connecting the back of the nose to the top of the throat

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Natural Causes

In medicine, death by natural causes is a loosely-defined term used by coroners describing death when the cause of death was a naturally occurring disease process

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Natural Childbirth

A technique of giving birth that stresses relaxation techniques so that the use of pain-relieving drugs can be minimized; also called prepared childbirth

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Natural History Study

A study of the natural development of a disease over time

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Natural Killer (NK) Cell

A type of white blood cell that attacks and kills tumor cells and cells infected with microorganisms

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Naturopathy

A system of natural healing based on the philosophy that the body has the ability to cure itself

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Nausea

Stomach distress characterized by an aversion to food and an urge to vomit

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Nebulizer

An instrument that provides a drug in its misted form through a face mask; used for severe asthma attacks and for children who have asthma

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Necroinflammation

Tissue inflammation and death

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Necrosis

Cell or tissue death

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Needle Aspiration

The use of a thin, hollow needle and syringe to remove body fluid for examination

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Needle aspiration biopsy

Medical test involving removal of cells or tissues with a needle

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Needle Biopsy

The use of a hollow, wide-diameter needle to remove a sample of tissue for examination

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Nelavan

The African sleep disease is fatal, characterized by morbid somnolence, headache, and emaciation

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Neonate

A newborn, especially within the first days or weeks after birth

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Neoplasm

An abnormal new mass of tissue that serves no purpose another term for a tumor

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Nephrectomy

The surgical removal of one or both kidneys

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Nephria

Nephritis; Inflammation of the Kidney, as Bright's disease

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Nephritis

Inflammation of the Kidney, as Bright's disease

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Nephroblastoma

A fast-growing cancer of the kidneys that occurs most commonly in children under 4 years of age

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Nephrolith

A calculus formed in the kidney; Kidney Stone

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