midline

[mid-lahyn]
noun
1.
Zoology. the median plane of the body of an animal.
2.
Geometry, midsegment.

Origin:
1865–70; mid- + line1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

midline mid·line (mĭd'līn')
n.
A medial line, especially the medial line or plane 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
There are seven of these groups or nuclei on either side of the midline and one medial nucleus.
Many of its axons cross the midline and probably ascend with the medial lemniscus to the ventro-lateral region of the thalamus.
The neck is straight, and the trachea is midline and mobile.
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