coarctation
noun
co·arc·ta·tion (ˌ)kō-ˌärk-ˈtā-shən 
: a stricture or narrowing especially of a canal or vessel (such as the aorta)
Example Sentences
Recent Examples on the Web In a statement posted to Twitter, Johnson — a three-star prospect from Phoenix, Arizona, committed to the Wolverines' 2020 class — wrote that he was born with a coarctation of his aorta. 
Orion Sang, Detroit Free Press, 30 Oct. 2019
Orion Sang, Detroit Free Press, 30 Oct. 2019 Word History
Etymology
Latin coarctation-, coarctatio tightening, from coarctare, coartare to constrict, from co- + artare to fix firmly, from artus close, tight; akin to Latin artus joint — more at article
First Known Use
1545, in the meaning defined above
Medical Definition
coarctation
noun
co·arc·ta·tion (ˌ)kō-ˌärk-ˈtā-shən
: a stricture or narrowing especially of a canal or vessel (as the aorta)