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Coarctation of the aorta, or aortic narrowing (abbreviated as CoA), is a congenital condition whereby the aorta narrows in the area where the ductus arteriosus (ligamentum arteriosum after regression) inserts.: Coarctation (narrowing) of the aorta. 1:Inferior vena cava, 2:Right pulmonary veins, 3: Right pulmonary artery, 4:Superior vena cava, 5:Left pulmonary artery, 6:Left pulmonary veins, 7:Right ventricle, 8:Left ventricle, 9:Pulmonary artery, 10:Aorta.
2. coarctation - (biology) a narrowing or constriction of a vessel or canal; especially a congenital narrowing of the aorta. narrowing-an instance of becoming narrow. biological science, biology-the science that studies living organisms. Translations.oun. 1. coarctation-tight or narrow compression. constriction. compression, contraction, condensation-the process or result of becoming smaller or pressed together; the contraction of a gas on cooling.