|1.||(of a pupa) enclosed in a hard barrel-shaped case (puparium), as in the housefly|
|2.||crowded or pressed together; constricted|
|3.||pathol (esp of the aorta) to become narrower; become constricted|
|[C15: from Latin coarctāre, to press together, from artus tight]|
|the offspring of a zebra and a donkey.|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
coarctation co·arc·ta·tion (kō'ärk-tā'shən)
A constriction, stricture, or stenosis.