Definitions for open-heart surgery
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Random House Webster's College Dictionary
o′pen-heart′ sur`gery(n.)
surgery performed on the exposed heart with the aid of a heart-lung machine.
Category: Surgery
Origin of open-heart surgery:
1975–80
Princeton's WordNet
open-heart surgery(noun)
heart surgery in which the rib cage is spread open, the heart is stopped and blood is detoured through a heart-lung machine while a heart valve or coronary artery is surgically repaired
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"open-heart surgery." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/open-heart surgery>.

