area of cardiac dullness

Medical Dictionary

area of cardiac dullness n.
A triangular area determined by percussion of the front of the chest that corresponds to the part of the heart not covered by lung tissue.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
area of cardiac dullness

noun
a triangular area of the front of the chest (determined by percussion); corresponds to the part of the heart not covered by the lungs 
WordNet® 3.0, © 2006 by Princeton University.
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