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| Rabies |
an infectious viral disease primarily affecting animals; can be transmitted to humans through an infected animal's bite; if untreated, can result in paralysis and death |
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| Radial keratotomy |
a surgical procedure for correcting near-sightedness in which tiny cuts are made in the cornea to change its shape and focusing properties |
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| Radiation |
a variety of types of energy, such as X-rays and ultraviolet |
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| Radiation therapy |
treatment of a disease, such as cancer, using forms of radioactivity that damage or destroy abnormal cells |
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| Radical surgery |
treatment of disease by surgically removing all tissue that is or may be affected |
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| Radiculopathy |
any disease of the nerve roots; can be caused by disk prolapse, arthritis, and other problems |
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| Radioallergosorbent test |
a blood test performed to help determine the cause of an allergy by detecting the presence of antibodies to various allergens |
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| Radiography |
the formation of images of the inside of the body using radiation projected through the body and onto film; a radiograph is also called an X-ray |
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| Radionuclide scanning |
an imaging technique in which a radioactive substance is introduced into the body and its emitted radiation is detected; specific organs can be studied according to the amount of the radioactive substance that they absorb |
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| Radius |
one of the two long bones of the forearm, located on the thumb side of the arm |
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| Radon |
a colourless, odourless, tasteless radioactive gas that is produced by materials in soil, rocks, and building materials; suspected of causing cancer |
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| Rales |
abnormal crackling or bubbling sounds heard in the lungs during breathing |
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| Rash |
an area of inflammation or a group of spots on the skin |
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| Raynaud's disease |
a condition in which the fingers and toes become pale when exposed to cold or emotional stress, owing to sudden narrowing of the arteries that supply them with blood |
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| Receptor |
a nerve cell that responds to a stimulus and produces a nerve impulse; also refers to the area on the surface of a cell that a chemical must bind to in order to have its effect |
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| Recessive gene |
a gene that does not produce its effect when it occurs with a dominant gene, but produces its effect only when there are two copies of it |
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| Reconstructive surgery |
surgery to rebuild part of the body that has been damaged or defective from birth |
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| Rectal prolapse |
bulging of the lining of the rectum through the anus, usually due to straining during a bowel movement |
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| Rectum |
a short tube located at the end of the large intestine, which connects the intestine to the anus |
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| Red blood cell |
a doughnut-shaped blood cell that carries oxygen from the lungs to body tissues |
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