(biology) a narrowing or constriction of a vessel or canal; especially a congenital narrowing of the aorta
coarctation详细解释
co.arc.ta.tion n.（名词）A narrowing or constricting, especially of the aorta or of a blood vessel.变窄：尤指血管或大动脉的变窄或收缩The state of being enclosed in an oval, horny case. Used of an insect pupa.封闭状态：封闭在椭圆形角质壳内的状态。用于一虫蛹
