Medical Dictionary Terms Beginning with R

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R

R: On a prescription the symbol R (or Rx) stands for the word Recipe, meaning (in Latin) to take. It is usually a part of the superscription (or heading) of the prescription. The other parts of the prescription are: the inscription which contain
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Racemose

Racemose: From the Latin ôracemusö meaning ôa cluster or bunch, particularly of grapes.ö The term is used in medical descriptive communications such as in pathology writings.
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Racemose aneurysm

Racemose aneurysm: An aneurysm that looks like a bunch of grapes.
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Radiation fibrosis

Radiation fibrosis: Scarring of the lungs from radiation. Radiation fibrosis is a sequel of radiation pneumonitis (inflammation of the lungs due to radiation), as from radiation therapy. Radiation preumonitis typically occurs after radiation treatments
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Radiation pneumonitis

Radiation pneumonitis: Inflammation of the lungs as a result of radiation. Although the radiation can be from various sources including accidents, today it is usually from radiation therapy. Radiation pneumonitis typically occurs after radiation tre
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Radiation therapy

Radiation therapy: In radiation therapy (also called radiotherapy), high-energy rays are used to damage cancer cells and stop them from growing and dividing. A specialist in radiation therapy is called a radiation oncologist. Like surgery, radia
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Radiograph

Radiograph: Medical term for an X-ray. A film produced by X-ray.
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Radiography

Radiography: Film records (radiographs) of internal structures of the body. Radiography is made possible by X-rays (or gamma rays) passing through the body to act on a specially sensitized film.
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Radioimmunoassay

Radioimmunoassay: A very sensitive, specific laboratory test (assay) using radiolabeled (and unlabeled) substances in an immunological (antibody-antigen) reaction.
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Radioinsensitive

Radioinsensitive: Not sensitive to X-rays and other forms of radiant energy. For example, a tumor may unfortunately be radioinsensitive. The opposite of radiosensitive.
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Radioiodine

Radioiodine: A radioactive isotope of iodine. (An isotope is an alternate version of a chemical element that has a different atomic mass). Radioiodine can be used in diagnostic tests as well as in radiotherapy of the thyroid. For hypert
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Radioisotope

Radioisotope: A radioactive isotope. (An isotope is an alternate version of a chemical element that has a different atomic mass).
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Radiologic

Radiologic: Having to do with radiology.
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Radiology

Radiology: The science of radiation, both ionizing (like X-ray) and nonionizing (like ultrasound), applied to the diagnosis and treatment of disease. Radiology is also known as roentgenology after Wilhelm Conrad Roentgen who discovered X-rays in 1895.
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Radiolucent

Radiolucent: Permeable to one or another form of radiation such as X-irradiation (X-rays). Radiolucent objects do not block radiation but let it pass. The opposite of "radiolucent" is "radiopaque." Metal, for instance, is radiopaque. If a child
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Radionuclide scan

Radionuclide scan: An exam that produces pictures (scans) of internal parts of the body. The patient is given an injection or swallows a small amount of radioactive material. A machine called a scanner then measures the radioactivity in certain organs.
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Radiopaque

Radiopaque: Opaque to one or another form of radiation such as X-irradiation (X-rays). Radiopaque objects are not pervious to radiation, instead, they block it. Metal, for instance, is radiopaque. If a child swallows a metal paperclip, the pap
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Radiosensitive

Radiosensitive: Sensitive to X-rays and other forms of radiant energy. For example, a tumor may be radiosensitive. The opposite is radioinsensitive.
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Radiotherapy

Radiotherapy: In radiotherapy (also called radiation therapy), high-energy rays are used to damage cancer cells and stop them from growing and dividing. A specialist in radiation therapy is called a radiation oncologist. Like surgery, radiation therap
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Radiotherapy

Radiotherapy: The treatment of disease with ionizing radiation. Synonymous with radiation therapy.
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