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mondofacto - Online Medical Dictionary
Category: Health and Medicine > Medical Dictionary
Date & country: 26/01/2008, UK
Words: 116197


radicotomy
Synonym: rhizotomy. ... Origin: L. Radix (radic-), root, + G. Tome, incision ... (05 Mar 2000) ...

radicul-
See: radiculo-. ... (05 Mar 2000) ...

radicula
A spinal nerve root. ... Origin: L. Dim of radix, root ... (05 Mar 2000) ...

radiculalgia
Neuralgia due to irritation of the sensory root of a spinal nerve. ... Origin: radicul-+ G. Algos, pain ... (05 Mar 2000) ...

radicular abscess
Alveolar abscess, an abscess around a tooth root. ... (05 Mar 2000) ...

radicular arteries
Branches of spinal arteries distributed to the dorsal and ventral roots of spinal nerves and their coverings.spinal arteries.. ... (05 Mar 2000) ...

radicular cyst
Slow-growing fluid-filled epithelial sac at the apex of a tooth with a nonvital pulp or defective root canal filling. ... (12 Dec 1998) ...

radicular fila
The small, individual fibre fascicles into which the roots of all of the spinal nerves and several cranial nerves (hypoglossus, vagus, oculomotorius) divide in fanlike fashion before entering or leaving the spinal cord or brainstem; the spinal dorsal root may divide into 8 to 12 such rootlets. ... Synonym: fila radicularia, root filaments. ... (05 Ma …

radicular pulp
That part of the dental pulp contained within the apical or root portion of the tooth. ... Synonym: pulpa radicularis. ... (05 Mar 2000) ...

radicular syndrome
A group of symptoms resulting from any interference with the intradural portion of one or more spinal nerve roots; the chief symptoms are pain, paresthesia, hypesthesia, or hyperesthesia, motor, trophic, and reflex disturbances. ... (05 Mar 2000) ...

radiculectomy
Synonym: rhizotomy. ... Origin: radicul-+ G. Ektome, excision ... (05 Mar 2000) ...

radiculitis
Inflammation of the root of a spinal nerve. The latin radix means root. ... (12 Dec 1998) ...

radiculo-
Radicul- ... Radicle; radicular. ... Origin: L. Radicula, radicle, dim. Of radix, root ... (05 Mar 2000) ...

radiculoganglionitis
Involvement of roots and ganglia. ... (05 Mar 2000) ...

radiculomeningomyelitis
Synonym for rhizomeningomyelitis ... Inflammation of the nerve roots, the meninges, and the spinal cord. ... Synonym: radiculomeningomyelitis. ... Origin: rhizo-+ G. Meninx, membrane, + myelon, marrow, + -itis, inflammation ... (05 Mar 2000) ...

radiculomyelopathy
Synonym for myeloradiculopathy ... Disease involving the spinal cord and nerve roots. ... Synonym: radiculomyelopathy. ... Origin: myelo-+ L. Radicula, root, + G. Pathos, disease ... (05 Mar 2000) ...

radiculoneuropathy
Disease of the spinal nerve roots and nerves. ... (05 Mar 2000) ...

radiculopathy
<pathology> A herniated intervertebral disk (nucleus pulposus) is one which has become displaced (prolapsed) from its normal position in between the vertebral bodies of the spine. ... Herniated disks often impinge on nearby nerve structures resulting in pain and neurologic symptoms. A clinical situation where the radicular nerve (nerve root) i …

radiectomy
Synonym: root amputation. ... Origin: L. Radix, root, + G. Ektome, excision ... (05 Mar 2000) ...

radiesthesia
Therapeutic cult concerned with intangible energies surrounding the living body and based on the detection of these intrinsic radiations by dowsing, or divining, or the use of more elaborate instruments (radionics). ... (12 Dec 1998) ...

radiferous
Containing radium. ... (05 Mar 2000) ...

radii
Plural of radius. ... Origin: L. ... (05 Mar 2000) ...

radii lentis
9 to 12 faint lines on the anterior and posterior surfaces of the lens that radiate from the poles toward the equator; they mark the lines along which the ends of lens fibres abut. ... Synonym: lens stars, lens sutures. ... (05 Mar 2000) ...

radio
1. <physics> The transmission and reception of electric impulses or signals by means of electric waves without a connecting wire, or the use of these waves for the wireless transmission of electric impulses into which sound is converted. ... 2. <anatomy, prefix> A combining form indicating connection with, or relation to, a radius or ray …

radio frequency current drive
<radiobiology> Plasma waves in the radio-frequency range can be used to push plasma particles in such a way that current forms in the plasma, this is a method of non-inductive current drive which would allow for steady-state fusion reactors to operate. ... (09 Oct 1997) ...

radio frequency heating
<radiobiology> Process for heating the plasma by transferring energy to ions or electrons using waves generated by an external oscillator at an appropriate frequency. (This is similar to how a microwave oven heats food.) There are various types: ... See: ECRH, ICRH, and Lower Hybrid. ... (09 Oct 1997) ...

radio frequency or radiofrequency
<physics> Term used to describe electromagnetic radiation with frequencies less than infrared, but greater than audio frequencies, i.e., greater than about 15,000 Hz. Wavelengths are therefore less than about 20,000 km and greater than about 0.01 mm. (These numbers are not precise.) ... (09 Oct 1997) ...

radio label
A mildly radioactive molecule that is used to tag another molecule (such as a protein) so that it can be identified as it goes through some kind of biochemical process. ... (09 Oct 1997) ...

radio wave
<physics> Electromagnetic radiation with wavelengths of 300 millimetres or longer (even up to several kilometres). Radiation of this type is used to broadcast radio and television signals, and has frequencies up to thousands of megahertz (or one gigahertz). ... (09 Oct 1997) ...

radio waves
That portion of the electromagnetic spectrum beyond the microwaves, with wavelengths as high as 30 km. They are used in communications, including television. Short wave or hf (high frequency), uhf (ultrahigh frequency) and vhf (very high frequency) waves are used in citisen's band communication. ... (12 Dec 1998) ...

radioactive
Giving off radiation. ... (12 Dec 1998) ...

radioactive atom
<chemistry, physics> An atom with an unstable nucleus, which emits particulate or electromagnetic radiation (radioactive emission) to achieve greater stability. ... See: radionuclide, half-life, Becquerel. ... (05 Mar 2000) ...

radioactive constant
Synonym for decay constant ... <physics, radiobiology> The fraction of the amount of a radionuclide that undergoes transition per unit time. Formally: ... Lamda=dP/dt ... Where dP is the probability of a given nucleus undergoing spontaneous nuclear transition in the time interval dt. ... (16 Dec 1997) ...

radioactive contamination
<radiobiology> Radioactive substance dispersed in material or places where it is undesirable. ... (16 Dec 1997) ...

radioactive cow
Colloquialism for radionuclide generator. ... See: cow. ... (05 Mar 2000) ...

radioactive decay
<physics> The process by which a spontaneous change in nuclear state takes place. This process is accompanied by the emission of energy in various specific combinations of electromagnetic and corpuscular radiation and neutrinos. ... (16 Dec 1997) ...

radioactive equilibrium
<radiobiology> That condition in which the activities of the members of a radioactive chain decrease exponentially in time with the half-life of the chain precursor. Such radioactive equilibrium is only possible when the half-life of the precursor is longer than that of any other chain member. If the precursor half-life is so long that the ch …

radioactive fallout
The material that descends to the earth or water well beyond the site of a surface or subsurface nuclear explosion. ... (12 Dec 1998) ...

radioactive iodide uptake test
Synonym for iodine uptake test ... A test of thyroid function in which 131I-iodide is given orally; after 24 hours, the amount present in the thyroid gland is measured and compared with normal values. ... Synonym: radioactive iodide uptake test, RAI test. ... (05 Mar 2000) ...

radioactive iodine
Iodine that gives off radiation. See radioiodine. ... (12 Dec 1998) ...

radioactive isotope
<physics, radiobiology> An isotope of an element that has an unstable nucleus, it tries to stabilise itself by giving off ionising radiation. ... (09 Oct 1997) ...

radioactive pollutants
Radioactive substances which act as pollutants. They include chemicals whose radiation is released via radioactive waste, nuclear accidents, fallout from nuclear explosions, and the like. ... (12 Dec 1998) ...

radioactive probe
Synonym for nucleic acid probe ... A nucleic acid fragment, labelled by a radioisotope, biotin, etc., that is complementary to a sequence in another nucleic acid (fragment) and that will, by hydrogen binding to the latter, locate or identify it and be detected; a diagnostic technique based on the fact that every species of microbe possesses some uni …

radioactive thyroxine
Thyroxine in which a radioisotope of iodine (125I or 131I) is incorporated into its molecule; used in experiments tracing the metabolism of thyroxine. ... Synonym: labelled thyroxine, radiolabelled thyroxine, radiothyroxin. ... (05 Mar 2000) ...

radioactive tracer
<physics, radiobiology> A radioisotope is an element which has the same atomic number as another but a different atomic weight, exhibiting the property of spontaneous decomposition. ... Decomposition gives off radiation (gamma rays) that can be detected with a counter. If a radioisotope is attached to a biological compound and injected into th …

radioactive tracers
Radioactive substances added in minute amounts to the reacting elements or compounds in a chemical process and traced through the process by appropriate detection methods, e.g., geiger counter. Compounds containing tracers are often said to be tagged or labelled. ... (12 Dec 1998) ...

radioactive waste
<radiobiology> Equipment and materials from nuclear operations which are radioactive and for which there is no further anticipated use. Wastes are generally classified as high-level (having radioactivity concentrations of hundreds to thousands of curies per gallon or cubic foot), low-level (in the range of 1 microcurie per gallon or cubic foo …

radioactivity
<radiobiology> The quality of emitting or the emission of corpuscular or electromagnetic radiations consequent to nuclear disintegration, a natural property of all chemical elements of atomic number above 83 and possible of induction in all other known elements. ... (18 Nov 1997) ...

radioallergosorbent test
An allergy test done on a sample of blood. The aim with rast, as with skin tests, is to check for allergic sensitivity to specific substances. Rast stands for radioallergosorbent test. ... (12 Dec 1998) ...

radioautogram
Older term for autoradiograph. ... (05 Mar 2000) ...

radioautography
Synonym for autoradiography ... <technique> A specimen containing radioactive atoms is overlaid with a photographic emulsion (X-ray film), which is subsequently developed, revealing the localisation of radioactivity as a pattern of silver grains. ... Resolution is determined by the path length of the radiation and so the low energy beta emittin …

radiobicipital
Relating to the radius and the biceps muscle. ... (05 Mar 2000) ...

radiobicipital reflex
Contraction of the biceps muscle which sometimes occurs in the elicitation of the brachioradial reflex. ... (05 Mar 2000) ...

radiobiology
Study of the scientific principles, mechanisms, and effects of the interaction of ionizing radiation with living matter. ... (12 Dec 1998) ...

radiocalcium
A radioisotope of calcium, particularly calcium-45. ... (05 Mar 2000) ...

radiocarbon
A radioactive isotope of carbon; e.g., 14C. ... (05 Mar 2000) ...

radiocardiogram
A graphic record of the concentration of injected radioisotope within the cardiac chambers. ... (05 Mar 2000) ...

radiocardiography
The technique of recording or interpreting radiocardiograms. ... (05 Mar 2000) ...

radiocarpal
1. Relating to the radius and the bones of the carpus. ... 2. On the radial or lateral side of the carpus. ... (05 Mar 2000) ...

radiocarpal articulation
Synonym for wrist joint ... The synovial joint between the distal end of the radius and its articular disk and the proximal row of carpal bones with the exception of the pisiform bone. ... Synonym: articulatio radiocarpea, carpal articulation, carpal joints, radiocarpal articulation, radiocarpal joint. ... (05 Mar 2000) ...

radiocarpal joint
Synonym for wrist joint ... The synovial joint between the distal end of the radius and its articular disk and the proximal row of carpal bones with the exception of the pisiform bone. ... Synonym: articulatio radiocarpea, carpal articulation, carpal joints, radiocarpal articulation, radiocarpal joint. ... (05 Mar 2000) ...

radiocephalpelvimetry
Synonym: pelvimetry. ... Origin: radio-+ cephal-+ pelvimetry ... (05 Mar 2000) ...

radiochemical purity
The proportion of the total activity of a specific radionuclide in a specific chemical or biological form. ... (05 Mar 2000) ...

radiochemistry
1. The science of using radionuclides to synthesise labelled compounds for biochemical or biological research, or radiopharmaceuticals for clinical diagnostic studies. ... 2. The study of methods of labeling compounds with radionuclides. ... (05 Mar 2000) ...

radiochlorine
A radioactive isotope of chlorine, e.g., 36Cl. ... (05 Mar 2000) ...

radiocholangiography
Cholang iography obtained by the intravenous administration of an excreted radiopharmaceutical. ... Origin: radio-+ cholangiography ... (05 Mar 2000) ...

radiocholecystography
Visualization of the gallbladder by scintigraphic means using a radiopharmaceutical such as technetium-99m labelled iminodiacetic acid derivative. ... Origin: radio-+ cholecysoghraphy ... (05 Mar 2000) ...

radiocineangiocardiography
Scinti graphic motion picture of the passage of a radiopharmaceutical through the heart and great vessels. ... Origin: radio-+ cineangiography ... (05 Mar 2000) ...

radiocineangiography
Scintigraphic motion pictures of the passage of a radiopharmaceutical through blood vessels. ... (05 Mar 2000) ...

radiocinematography
T aking a motion picture of the movements of organs or other structures as revealed by an X-ray fluoroscopic examination. ... Origin: radio-+ G. Kinema, motion, + grapho, to write ... (05 Mar 2000) ...

radiocobalt
A radioactive isotope of cobalt; e.g., 60Co. ... (05 Mar 2000) ...

radiocurable
Curable by irradiation therapy. ... (05 Mar 2000) ...

radiodense
Synonym for radiopaque ... A radiopaque substance (for example metal) will be highlighted (appear white) on a plain X-ray. The use of iodine containing radiopaque contrast dyes allow enhancement of the anatomy demonstrable with conventional X-ray. ... (27 Sep 1997) ...

radiodensity
Synonym for radiopacity ... State of being radiopaque. ... Synonym: radiodensity. ... (05 Mar 2000) ...

radiodermatitis
A cutaneous inflammatory reaction occurring as a result of exposure to ionizing radiation. ... (12 Dec 1998) ...

radiodiagnosis
Diagnosis using X-rays; or, more broadly, diagnostic imaging, including radiology, ultrasound, and magnetic resonance. ... (05 Mar 2000) ...

radiodigital
Relating to the fingers on the radial or lateral side of the hand. ... (05 Mar 2000) ...

radioelectrophysiologram
The record obtained by means of the radioelectrophysiolograph. ... (05 Mar 2000) ...

radioelectrophysiolograph
Formerly, an apparatus carried by a mobile individual by means of which changes in electrical potential from the brain or heart can be picked up and radio-transmitted to an electroencephalograph or an electrocardiograph. ... See: telemeter. ... (05 Mar 2000) ...

radioelectrophysiolography
Formerly, recording the changes in the electrical potential of the brain or heart by means of the radioelectrophysiolograph. ... See: telemetry. ... (05 Mar 2000) ...

radioelement
Any element possessing radioactivity. ... (05 Mar 2000) ...

radioepidermitis
Synonym for radiodermatitis ... A cutaneous inflammatory reaction occurring as a result of exposure to ionizing radiation. ... (12 Dec 1998) ...

radioepithelitis
Destructive changes in epithelium produced by ionizing radiation. ... (05 Mar 2000) ...

radiofrequency
1. Radiant energy of a certain frequency range; e.g., radio and television employ radiant energy having a frequency between 105-1011 Hz, while diagnostic X-rays have a frequency in the range of 3 &times; 1018 Hz. ... 2. In magnetic resonance imaging, the energy applied to switch or create a gradient in the magnetic field. ... (05 Mar 2000) ...

radiofrequency plugging
<radiobiology> Use of axial ponderomotive force to plug an open-ended device. First demonstrated on RFC-XX, Institute of Plasma Physics, Nagoya University, Nagoya, Japan, and later demonstrated in the Phaedrus device at the University of Wisconsin. ... (09 Oct 1997) ...

radiofrequency pulse
In nuclear magnetic resonance, a short electromagnetic signal used to change the direction of the magnetic field. ... See: sequence pulse. ... (05 Mar 2000) ...

radiofrequency trapping
<radiobiology> Use of RF waves to pitch angle scatter particles flowing axially into a magnetic mirror cell. The particles are scattered out of the loss cone and are trapped. (See entries for pitch angle scattering, magnetic mirror, loss cone.) ... (09 Oct 1997) ...

radiogallium
Gallium that is radioactive. ... See: gallium-67, gallium-68. ... (05 Mar 2000) ...

radiogenesis
The formation or production of radioactivity resulting from radioactive transformation or disintegration of radioactive substances. ... Origin: radio-+ G. Genesis, production ... (05 Mar 2000) ...

radiogenic
1. Producing rays of any sort, especially electromagnetic rays. ... 2. Caused by x-or gamma rays. ... (05 Mar 2000) ...

radiogenics
The science of radiation. ... (05 Mar 2000) ...

radiogold colloid
A radioactive isotope of gold emitting negative beta particles and gamma radiation, with a half-life of 2.7 days; formerly used for irradiation of closed serous cavities in the palliative treatment of ascites and pleural effusion due to metastatic malignancies, and for liver scans. ... Synonym: 198Au colloid, colloidal radioactive gold. ... (05 Mar 2 …

radiogram
An obsolete term for radiograph. ... Origin: radio-+ G. Gramma, something written ... (05 Mar 2000) ...

radiograph
<dentistry> Another name for an X-ray ... (08 Jan 1998) ...

radiographer
A nonmedically qualified person who assists the radiologist in imaging (diagnostic radiographer) or the radiotherapist in treatment (therapeutic radiographer). ... (16 Dec 1997) ...

radiographic image enhancement
Improvement in the quality of an X-ray image by use of an intensifying screen, tube, or filter and by optimum exposure techniques. Digital processing methods are often employed. ... (12 Dec 1998) ...

radiographic magnification
Use of optic and geometric techniques to enhance radiographic image quality and interpretation. It includes use of microfocal X-ray tubes and intensifying fluoroscopic screens. ... (12 Dec 1998) ...

radiographic parallel line shadows
Synonym for tram lines ... The images of bronchial walls, usually thickened; colloq., British. ... Synonym: radiographic parallel line shadows. ... (05 Mar 2000) ...

radiography
<investigation, procedure> The making of film records (radiographs) of internal structures of the body by passage of X-rays or gamma rays through the body to act on specially sensitised film. ... Origin: Gr. Graphein = to write ... (18 Nov 1997) ...

radiography, abdominal
Radiographic visualization of the body between the thorax and the pelvis, i.e., within the peritoneal cavity. ... (12 Dec 1998) ...