American Heritage Dictionary
(2)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
That almost certainly meant the boy had a "coarctation," or blockage of his aorta, which is the key pipeline supplying oxygen-rich blood to the body.— NYT > Home Page
Most deaths due to a missed diagnosis were from HLHS and coarctation of the aorta.— Archives of Pediatrics current issue
Luke had coarctation of the aorta, a dangerous narrowing that causes high blood pressure and thickening of the heart's main pumping chamber.— Iowa City Press-Citizen - Hawkeye Sports
However, there will be another coarctation with full two year followup will be the complete final clinical data step.— SeekingAlpha.com: Home Page
I know how difficult this can be, as my little one was born with a coarctation of the aorta.— Don't Get Me Started with Linda Sharp

Century Dictionary (1)
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