| 释义 |
DictionarySeegangrenesymmetrical achromat lens symmetrical achromat lens[sə′me·trə·kəl ′ak·rə‚mat ′lenz] (optics) An older type of camera lens in which two positive achromatic meniscus lenses are symmetrically arranged about the stop. symmetrical gangrene
sym·met·ri·cal gan·grenegangrene affecting the extremities of both sides of the body; it is seen particularly in severe arteriosclerosis, myocardial infarction, and ball-valve thrombus.symmetrical gangrene Gangrene that affects both legs and arises in a background of prominent atherosclerosis.symmetrical gangreneGangrene on opposite sides of the body in corresponding parts, usually the result of vasomotor disturbances. It is characteristic of Raynaud disease and Buerger disease. See also: gangrene |