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| rabies | | An acute infectious disease of the central nervous system affecting ... |
| radiation | | Emission or propagation of electromagnetic energy (waves/rays), or the waves/rays ... |
| radiation-induced neoplasms | | Tumors, cancer or other neoplasms produced by exposure to ionizing ... |
| radicular cyst | | Slow-growing fluid-filled epithelial sac at the apex of a tooth ... |
| radioactive air pollutants | | Pollutants, present in air, which exhibit radioactivity. ... |
| radiodermatitis | | A cutaneous inflammatory reaction occurring as a result of exposure ... |
| radiography | | Examination of any part of the body for diagnostic purposes ... |
| radioisotope renography | | Graphic tracing over a time period of radioactivity measured externally ... |
| radiologic technology | | The application of scientific knowledge or technology to the field ... |
| radiology | | A specialty concerned with the use of x-ray and other ... |
| radionuclide angiography | | The measurement of visualization by radiation of any organ after ... |
| radionuclide imaging | | Process whereby a radionuclide is injected or measured (through tissue) ... |
| radionuclide ventriculography | | Imaging of a ventricle of the heart after the injection ... |
| radon | | A naturally radioactive element with atomic symbol Rn, atomic number ... |
| ranula | | A form of retention cyst of the floor of the ... |
| rationalization | | A defense mechanism operating unconsciously, in which the individual attempts ... |
| reactive oxygen species | | Molecules or ions formed by the incomplete one-electron reduction of ... |
| reagent strips | | Narrow pieces of material impregnated or covered with a substance ... |
| records | | The commitment in writing, as authentic evidence, of something having ... |
| rectal administration | | The insertion of drugs into the rectum, usually for confused ... |
| recurrent laryngeal nerve | | Branches of the vagus (tenth cranial) nerve. The recurrent laryngeal ... |
| red algae | | Algae of the division Rhodophyta, in which the red pigment ... |
| reference standards | | A basis of value established for the measure of quantity, ... |
| reflex | | An involuntary movement or exercise of function in a part, ... |
| reflexotherapy | | Treatment of some morbid condition by producing a reflex action, ... |
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