| RD | radial deviation; radiology department; rate difference; Raynaud disease; reaction of degeneration; ... |
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| REAR | renal, ear, anal, and radial [malformation syndrome] |
| RF | radial fiber; radio frequency; receptive field; regurgitant fraction; Reitland-Franklin [unit]; rela... |
| RID | radial immunodiffusion; remission-inducing drug; ruptured intervertebral disc |
| RK | rabbit kidney; radial keratotomy; reductase kinase; rhodopsin kinase; right kidney |
pin-head pigmentation spot
| radial acceleration | The centripetal acceleration of a particle or vehicle moving along a curved path at a constant velocity; e.g., turning a curve in an automobile, pulling out of a dive, or performing a loop manoeuvre in an aircraft. In aviation, acceleration varies directly with the square of the air speed and inversely with the radius of the turn (a = V2/r, where V is air speed and r is radius of turn). (05 Mar 2000) |
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| radial aplasia-thrombocytopenia syndrome | <syndrome> Aplasia (absence) of the radius (the long bone on the thumb-side of the forearm) and thrombocytopenia (low blood platelets) are key features characterizing this syndrome. There is phocomelia (flipper-limb) with the thumbs always present. The fibula (the smaller bone in the lower leg) is often absent. The risk of bleeding from too few platelets is high in early infancy but lessens with age. The condition is inherited in an autosomal recessive trait with one gene (on a non-sex chromosome) coming from each parent to the child affected with the disease. Alternative names include thrombocytopenia-absent radius syndrome, tar syndrome, and tetraphocomelia-thrombocytopenia syndrome. (12 Dec 1998) |
| radial artery | <anatomy, artery> The direct continuation of the brachial trunk, originating at the bifurcation of the brachial artery opposite the neck of the radius. Its branches may be divided into three groups corresponding to the three regions in which the vessel is situated, the forearm, wrist, and hand. (12 Dec 1998) |
| radial border of forearm | An imaginary line running along the outermost extent of the forearm separating anterior and posterior surfaces laterally. Synonym: margo lateralis antebrachii, margo radialis antebrachii, radial border of forearm. (05 Mar 2000) |
| radial bursa | <anatomy> The synovial sheath that envelops the tendon of the flexor pollicis longus in its course through the carpal canal; it is continuous with the digital sheath of the thumb, the two generally being considered as one sheath. Synonym: vagina tendinis musculi flexoris pollicis longi, radial bursa. (05 Mar 2000) |
| radial clubhand | Clubhand with angular deviation towards radial side of limb. See: manus valga. (05 Mar 2000) |
| radial collateral artery | <anatomy, artery> The anterior terminal branch of the profunda brachii, anastomosing with the radial recurrent, forming part of the articular network of the elbow. Synonym: arteria collateralis radialis. (05 Mar 2000) |
| radial collateral ligament | The ligament that connects the lateral epicondyle of the humerus with the annular ligament of the radius. Synonym: ligamentum collaterale radiale, lateral ligament of elbow, radial collateral ligament. (05 Mar 2000) |
| radial collateral ligament of elbow | The ligament that connects the lateral epicondyle of the humerus with the annular ligament of the radius. Synonym: ligamentum collaterale radiale, lateral ligament of elbow, radial collateral ligament. (05 Mar 2000) |
| radial collateral ligament of wrist | The ligament that extends distally from the styloid process of the radius to the carpal bones. Synonym: ligamentum collaterale carpi radiale, external collateral ligament of wrist, lateral ligament of wrist. (05 Mar 2000) |
| radial eminence of wrist | A rather large flat eminence on the radial side of the palmar aspect of the wrist, due to the tuberosity of scaphoid and the ridge on the trapezium. Synonym: eminentia carpi radialis. (05 Mar 2000) |
| radial flexor muscle of wrist | <anatomy, muscle> Origin, common flexor origin of the medial condyle of humerus; insertion, anterior surface of the base of the second and most often sending a slip to that of the third metacarpal bone; action, flexes and abducts wrist radialward; nerve supply, median; its tendon travels in its own canal roofed by a layer of the transverse carpal ligament. Synonym: musculus flexor carpi radialis, radial flexor muscle of wrist. (05 Mar 2000) |
| radial fossa of humerus | A shallow depression on the anterior aspect of the distal humerus, superior to the capitulum of the humerus and lateral to the coronoid fossa, in which the margin of the head of the radius rests when the elbow is in extreme flexion. Synonym: fossa radialis humeri. (05 Mar 2000) |
| radial growth phase | The early pattern of growth of cutaneous malignant melanoma, in which tumour cells spread laterally in the epidermis. (05 Mar 2000) |
| radial immunodiffusion | <technique> A quantitative variation of immunodiffusion in which the agar gel contains evenly distributed antigen (or antibody) and its counterpart from the test sample diffuses into the gel from a single well resulting in a circular precipitin line around the sample well. The diameter of the precipitin ring is proportional to the concentration of the antibody (or antigen) present in the test sample. By comparing the diameter of the test specimen precipitin ring to known standards, a relatively insensitive estimation of the concentration of specific antibody or antigen can be achieved. (01 Dec 1998) |