limbic system

noun Anatomy.
a ring of interconnected structures in the midline of the brain around the hypothalamus, involved with emotion and memory and with homeostatic regulatory systems.

1950–55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
limbic system (ˈlɪmbɪk)
the part of the brain bordering on the corpus callosum: concerned with basic emotion, hunger, and sex
[C19 limbic, from French limbique, from limbe limbus, from New Latin limbus, from Latin: border]

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

limbic system n.
A group of deep brain structures, common to all mammals and including the hippocampus, amygdala, gyrus fornicatus, and connecting structures, associated with olfaction, emotion, motivation, behavior, and various autonomic functions.

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
limbic system   (lĭm'bĭk)  Pronunciation Key 
A group of interconnected structures of the brain including the hypothalamus, amydala, and hippocampus that are located beneath the cortex, are common to all mammals, and are associated with emotions such as fear and pleasure, memory, motivation, and various autonomic functions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Our higher-level skills of synthesis and evaluation are controlled by the
  limbic system, where our emotions are seated.
In fact, the limbic system as well as the neocortex remains largely undeveloped.
He found a group of cells within it that connect directly to the limbic system,
  the brain's emotion-generating area.
Basic emotions, such as fear, are regulated in part of the brain called the
  limbic system.
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