(biology) a congenital narrowing of the aorta

WordNet Word definitions in WordNet
n. tight or narrow compression [syn: constriction ] (biology) a narrowing or constriction of a vessel or canal; especially a congenital narrowing of the aorta

Wiktionary Word definitions in Wiktionary
n. 1 (context medicine English) A stenosis, especially of the aorta. 2 (context obsolete English) confinement to a narrow space 3 (context obsolete English) pressure; that which presses

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Coarctation \Co`arc*ta"tion\, n. [L. coarctatio.] Confinement to a narrow space. [Obs.] --Bacon. Pressure; that which presses. [Obs.] --Ray. (Med.) A stricture or narrowing, as of a canal, cavity, or orifice.