midbrain

[mid-breyn]
noun Anatomy.
the middle of the three primary divisions of the brain in the embryo of a vertebrate or the part of the adult brain derived from this tissue; mesencephalon.

Origin:
1870–75; mid- + brain

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Collins
World English Dictionary
midbrain (ˈmɪdˌbreɪn)
 
n
the nontechnical name for mesencephalon

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

midbrain mid·brain (mĭd'brān')
n.
See mesencephalon.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
midbrain  [%PREMIUM_LINK%]     (mĭd'brān')  Pronunciation Key 
The middle part of the vertebrate brain. In most animals except mammals, the midbrain processes sensory information. In mammals, it serves primarily to connect the forebrain with the hindbrain. Compare forebrain, hindbrain.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In swarming locusts, the midbrain grew more than the optic lobes.
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