the middle section or part of anything.
the solar plexus; midriff: a hard right to the midsection.

1935–40; mid- + section

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World English Dictionary
midsection (ˈmɪdˌsɛkʃən)
1.  the middle of something
2.  the middle region of the human body; midriff

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

midsection mid·sec·tion (mĭd'sěk'shən)
A middle section, especially the midriff of the body.

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
We then ingest that food and convert it into human energy stored as glycogen in
  muscles and as fats-notably around our midsection.
The tongue is already weakened by growing rifts on both sides of its midsection.
It begins at the park's midsection, sweeping east across empty basins stubbled
  with creosote bushes.
Here, a one-shoulder gown gets a modern oomph with an abstract print at the
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