forebrain

[fawr-breyn, fohr-]
noun Anatomy.
1.
Also called prosencephalon. the anterior 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 including the diencephalon and telencephalon.
2.
the telencephalon.

Origin:
1875–80; fore- + brain

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Collins
World English Dictionary
forebrain (ˈfɔːˌbreɪn)
 
n
the nontechnical name for prosencephalon

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

forebrain fore·brain (fôr'brān')
n.
The prosencephalon.

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
forebrain  [%PREMIUM_LINK%]     (fôr'brān')  Pronunciation Key 
The forwardmost part of the vertebrate brain. In humans, it consists of the thalamus, the hypothalamus, and the cerebrum. Compare hindbrain, midbrain.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
These kinds of problems mainly occur after an injury to the forebrain.
The researchers note that the white matter appears to fray more over time in the forebrain than in the brain's rear.
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