highest point or state; peak.
the united kingdom has historically played a leading role in developing parliamentary democracy and in advancing literature and science. at its zenith in the 19th century, the british empire stretched over one-fourth of the earth's surface. the first half of the 20th century saw the uk's strength seriously depleted in two world wars and the irish republic's withdrawal from the union. the second half witnessed the dismantling of the empire and the uk rebuilding itself into a modern and prosperous european nation. as one of five permanent members of the un security council and a founding member of nato and the commonwealth, the uk pursues a global approach to foreign policy. the scottish parliament, the national assembly for wales, and the northern ireland assembly were established in 1998. cia.gov
following yaroslav's reign (1019–54), which marked the zenith of kiev's power, kievan rus split into principalities, including the western duchies of halych (see galicia) and volodymyr (see volodymyr-volynskyy and volhynia). these and the rest of the western region, which included podolia, had separate histories after the conquest of kievan rus (13th cent.) by the mongols of the golden horde. factmonster.com
an indigenous people of mexico who, in 1325, founded tenochtitlán. they were in the zenith of their power in the fourteenth and fifteenth centuries. when the spaniards arrived, their king was montezuma; their supreme god was taoti; and huitzilopochtli was the divine protector of their nation, to whom they offered human victims. infoplease.com
the upper portion of the graft includes 1 to 5 small holes (fenestrations) or cuffs (side branches) that allow the graft to be located above the renal arteries without blocking blood flow to them. these small holes or branches are the investigational part of this research study. this is needed when there is not enough healthy aorta below the renal arteries. at least one artery may also be treated with an alignment stent (small tubular stainless steel structures) to help keep the arteries open and aligned with the fenestrations or branches. the zenith t-branch and physician-specified fenestrated and branched endovascular graft will be referred to as the zenith fenestrated-branched system. mayoclinic.org
intorre, f., polito, a., andriollo-sanchez, m., azzini, e., raguzzini, a., toti, e., zaccaria, m., catasta, g., meunier, n., ducros, v., o'connor, j. m., coudray, c., roussel, a. m., and maiani, g. effect of zinc supplementation on vitamin status of middle-aged and older european adults: the zenith study. eur.j clin nutr 2008;62(10):1215-1223. view abstract. medicinenet.com
the zenith p-branch endovascular graft may be anatomically suitable for up to two-thirds of patients requiring technically demanding treatment for juxta- or pararenal abdominal aortic aneurysms. researchers reached that conclusion after examining ct angiograms of patients who had previously undergone endovascular aneurysm repair with the chimney technique. (journal of endovascular therapy) medpagetoday.com