Dictionary

Enter a word or phrase below to search our online dictionary of over 1,300 general medical terms, or click on a letter of the alphabet to view all terms beginning with that letter:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Search for 'N'

Phrase Definition
narcissistic Self-centered, being "in love" with oneself.
narcolepsy Frequent and uncontrolled desire for sleep.
nausea A feeling of sickness in the stomach, sometimes followed by the urge to vomit.
nebulizer A device that produces a very fine vapor to be inhaled.
necrosis Death of a cell or tissue.
nematode A roundworm that may infest the digestive tract of humans.
neoplasm A new growth, tumor.
nephrectomy Surgical removal of a kidney.
nephritis Inflammation of a kidney.
nephropathy Disease of the kidneys. Swelling or breakdown of the kidney.
nephrosis A disease of the kidney that causes malfunction but no inflammation. Also called nephrotic syndrome.
nerve A cord-like structure made up of special tissue for carrying electrical impulses from one part of the body to another.
neuralgia Pain along the course of a nerve.
neuritis Inflammation of a nerve.
neurofibromatosis An inherited disorder that causes dark spots on the skin and tumors of the skin, peripheral, optic and acoustic nerves.
neurology The branch of medicine that pertains to the nervous system.
neuroma A benign but sometimes painful tumor growing on a nerve.
neuron A nerve cell.
neuropathy Disease of the nervous system or of an individual nerve.
neurosis An emotional disorder that can interfere with a person's ability to lead a normal life.
neutrophil A mature white blood cell with a three- to five-lobed nucleus.
nevus A mole or other colored spot on the skin.
nicotine A highly toxic and addictive component of tobacco. While the amounts obtained from smoking may not be enough to be immediately fatal, there's a cause-and-effect relationship to heart disease.
night blindness A reduced ability to see in dim light. May be caused by a vitamin-A deficiency or glaucoma.
nit The egg of a louse.
nocturia Excessive urination at night.
node A swelling, knot or knob.
nonunion Failure of the ends of a broken bone to mend.
norepinephrine A hormone produced by the adrenal medulla and certain sympathetic nerve fibers.
nosocomial Having to do with the hospital. For example, an nosocomial infection is one that's acquired during hospitalization.