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Medical Dictionary: n

N&Vnausea and vomiting digestive
Nasodium general
NADno acute distress general
nailsThe thin, translucent, horny plates that cover the dorsal surfaces of the distal phalanges of the fingers and toes General
nano-one-billionth, dwarfismgeneral
nanospheresSpherical particles of nanometer dimensions. General
narc/osleep, numbness, stuporNervous
narcissismExcessive admiration of self.General
narcolepsyA chronic brain disorder that involves poor control of sleep-wake cycles.nervous
narcoticsAgents that dull the sense of pain and cause somnolence. They are comprised of natural or synthetic derivatives of opium or morphine or any substance that has such effects. General
naresAn external opening in the nasal cavity. A nostril.Respiratory
nasal cavityThe proximal portion of the respiratory passages on either side of the nasal septum. On inhalation the air is warmed, moistened, smelled and filtered.Respiratory
nasal decongestantsDrugs designed to treat inflammation of the nasal passages.Respiratory
nasal lavageIrrigation of the nose with saline or irrigation solutions to remove irritants, allergens or microorganisms from the nose. Respiratory
nasal septumThe partition separating the two nasal cavities in the midplane. Respiratory
nasionA point on the skull where the top of the nose meets the ridge of the forehead.Skeletal
nasolacrimal ductA tubular duct that conveys tears from the lacrimal gland to the nose. Eyes And Ears
nasopharynxThe top portion of the pharynx situated posterior to the nose and superior to the soft palate. Respiratory
natalRelating to birth.reproductive
nauseaAn unpleasant sensation in the stomach accompanied by the inclination to vomit. Digestive
NCINational Cancer Institute
NDCNational Drug Code
nebulizersDevices that create an aerosol a mist (vapor). It is used to administer drugs or to humidify air.Respiratory
neckThe body part connecting the head to the rest of the body. Skeletal
necr-death, corpsegeneral
necrobiosisThe natural death of cells due to age, use or development.General
necrobiotic disordersA group of disorders characterized by swelling, basophilia, and distortion of collagen bundles in the dermis. Integumentary
necrosisPathological cell or tissue death, caused by damage, trauma, ischemia or infection.General
necrotizing fasciitisA rare but serious infection caused by bacteria. It destroys skin, fat and tissue covering muscles.integumentary
needle sharingUsage of a single needle among two or more people for injecting drugs, a high-risk behavior for contracting infectious disease. General
negativismBehavior marked by extreme skepticism and persistent resistance to external advice. Nervous
nemosisThe process of cell activation and death in fibroblasts.General
neocortexThe largest portion of the cerebral cortex, the outer surface of the cerebrum, responsible for spatial reasoning, thought, language, memory and sensory perception.Nervous
neonatalPertaining to a new baby, for the first 28 days after birth.Reproductive
neonateAn infant less than one month old.reproductive
neoplasiaThe formation of a neoplasmGeneral
neoplasmAn abnormal new growth of tissue. Also called a tumor.General
neovascularizationFormation of new blood vessels.Cardiovascular
nephralgiaPain in the kidney.General
nephrectomyExcision of kidney. General
nephritisInflammation of any part of the kidney. Urinary
nephrolithiasisFormation of kidney stones.urinary
nephrologyA subspecialty of medicine concerned with the kidney. Urinary
nephronVery small filtering structures in the kidneys.urinary
nephrosclerosisHardening of the kidney due to infiltration by fibrous connective tissue. Usually caused by chronic hypertension. Urinary
nephrosisAny degenerative disease of the kidney.Urinary
nephrotic syndromeDisease of the kidney without inflammatory or neoplastic components.urinary
nerveA cordlike structure of the body, comprising a collection of conducting fibers that convey impulses between a part of the central nervous system and another body region.Nervous
nerve blockInterruption of neural conduction in peripheral nerves or nerve trunks by the injection of a local anesthetic agent.Nervous
neural conductionThe propagation of the nerve impulse along the nerve away from the site of an excitation stimulus. Nervous
neuralgiaIntense pain that occurs along the course of a peripheral or cranial nerve. Nervous
neurapraxiaA peripheral nerve injury marked by a temporary loss of conduction of impulses.Nervous
neurastheniaA mental disorder characterized by chronic fatigue and concomitant physiologic symptoms. Nervous
neuri-nerve, nervous systemnervous
neuritisA general term indicating inflammation of a nerve, often marked by pain, numbness or tingling, or paralysis.Nervous
neurocytomaA brain tumor of undifferentiated cells of nervous origin.Nervous
neurodermatitisAn extremely variable eczematous skin disease that is presumed to be a response to prolonged vigorous scratching, rubbing, or pinching to relieve intense pruritus. Integumentary
neuroendocrinePertaining to the relationships between the nervous and endocrine systemsGeneral
neuroendocrinologyThe study of the relationships between the nervous system and the endocrine system. General
neurofibromaA moderately firm, benign, encapsulated tumor resulting from proliferation of Schwann cells and fibroblasts that includes portions of nerve fibers. Nervous
neurofibrosarcomaA malignant tumor that arises from small cutaneous nerves, is locally aggressive, and has a potential for metastasis. Nervous
neurogenesisFormation of neurons which involves the differentiation and division of stem cells in which one or both of the daughter cells become neurons. Nervous
neurogliaThe supportive tissue of the nervous systemNervous
neurologicalPertaining to the nervous systemNervous
neurologyA medical specialty concerned with the study of the structures, functions, and diseases of the nervous system. Nervous
neuromaA benign neoplasm composed of nerve cells and nerve fibers.Nervous
neuromuscularDisorders that affect the nerves that control voluntary muscles. muscular
neuronThe basic cellular unit of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the nervous system. Nervous
neuroretinitisInflammation of the optic nerve and retina.Nervous
neurotransmittersChemical messengers that carry signals to other cells in the body.nervous
neurotropicHaving an affinity for the nervous system or the growth of neural tissue.Nervous
neutropeniaAbnormally decrease in the numbers of neutrophils in circulating blood.Cardiovascular
neutrophilsA type of white blood cell that is an early responder to infections.Cardiovascular
nev/omole, birthmarkgeneral
nevusA malformation of skin that is present at birth, including moles and birthmarks.Integumentary
NGnasogastric digestive
NGFnerve growth factornervous
niacinA water-soluble vitamin B complex. General
nicotineA highly toxic alkaloid. General
nictationA reflex that closes and opens the eyes rapidly. Blinking.Eyes And Ears
NICUneonatal intensive care unit
NIDDMnoninsulin-dependent diabetes mellitus endocrine
night blindnessFailure or reduced ability to see in dim light.Eyes And Ears
night terrorsA sleep disorder characterized by episodes of abrupt awakening suggesting extreme fright. This condition primarily affects children and young adults.General
NIHNational Institutes of Health
nippleThe conic projection on the breast which provides an outlet for milk from the mammary glands. General
nitrogenAn element with the atomic symbol N, atomic number 7, comprising 78% of the earth's atmosphere by volume.General
nitroglycerinA vasodilator which relieves angina pectoris.Cardiovascular
NKnatural killer lymphatic
NKAno known allergies
NMJneuromuscular junction muscular
nocebo effect A negative placebo effect.General
nocturiaPatient needs to wake at night to pass urine.urinary
nocturnal enuresisInvoluntary discharge of urine during sleep at night after expected age of completed development of urinary control. Urinary
nocturnal myoclonusA sleep disorder where the patient moves involuntarily during sleep. Also called periodic limb movement disorder.muscular
-noiamind, willnervous
nomen-name, pertaining to namesgeneral
norepinephrineA neurotransmitter that is secreted in response to stress, increasing blood pressure and glucose.endocrine
normotensiveHaving normal blood pressure.Cardiovascular
norovirusA virus associated with epidemic gastroenteritis.Digestive
noseA part of the upper respiratory tract. It includes the external nose, the nasal cavity, and the paranasal sinuses. Respiratory
nosocomial pneumoniaPneumonia acquired during a hospital stay.Respiratory
nostrumsMedicines whose effectiveness is unproven and whose ingredients are often secret. A quack remedy.General
noto- backskeletal
noxaeAnything harmful to the body. General
NPnurse practitioner
NPNnonprotein nitrogen urinary
NPOnothing by mouth general
NSnormal saline general
NSAIDnonsteroidal anti-inflammatory drug
NSRnormal sinus rhythm cardiovascular
NTDneural tube defectnervous
nucleic acidAny of a group of long, linear macromolecules, either DNA or various types of RNA, that carry genetic information.General
nucleotidesThe base units of nucleic acids. General
nucleusThe part of a cell that contains DNA and RNA.General
nulligravidaA woman who has never been pregnant. reproductive
nulliparaA woman who has never borne a child.reproductive
nutationThe act of nodding one's head, especially involuntarily.General
nutri/oto nourishdigestive
nyct/onight, darknessgeneral
nyctalopiaNight blindness.eyes and ears
nystagmusA vision condition in which the eyes make repetitive, uncontrolled movements, usually side to side.eyes and ears

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