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[mid-breyn] /ˈmɪdˌbreɪn/
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 of midbrain
1870-75; mid- + brain Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for midbrain
  • In swarming locusts, the midbrain grew more than the optic lobes.
British Dictionary definitions for midbrain


the nontechnical name for mesencephalon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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midbrain in Medicine

midbrain mid·brain (mĭd'brān')
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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midbrain in Science
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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