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open-ended credit
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open-heart surgery
o·pen-heart sur·ger·y


noun 
Definition:
 
surgery on exposed heart: heart surgery during which the heart is exposed and blood is circulated outside the body by mechanical means
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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