solar plexus

noun
1.
Also called celiac plexus. Anatomy. a network of nerves situated at the upper part of the abdomen, behind the stomach and in front of the aorta.
2.
a point on the stomach wall, just below the sternum, where a blow will affect this nerve center.

Origin:
1765–75; so called from the raylike pattern of the nerve fibers

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World English Dictionary
solar plexus
 
n
1.  anatomy Also called: coeliac plexus the network of sympathetic nerves situated behind the stomach that supply the abdominal organs
2.  (not in technical usage) the part of the stomach beneath the diaphragm; pit of the stomach
 
[C18: referring to resemblance between the radial network of nerves and ganglia and the rays of the sun]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

solar plexus n.
See celiac plexus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
If that got you in the solar plexus, you might want to sit down before you keep reading.
He is wearing a blue officer's coat and a shirt open to his solar plexus.
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