[1] : The Collaborative International Dictionary of English v.0.48

limbic system \limbic system\ n. anatomy, neurophysiology
   a group of neural structures in the brain below the cerebral
   cortex, centered on the hypothalamus and including the
   hippocampus and amygdala, involved with control of emotion,
   motivation, memory, and some homeostatic regulatory
   processes.
   wordnet 1.5

         at the most ancient part of the human brain lies the
         spinal cord; the medulla and pons, which comprise the
         hindbrain; and the midbrain. this cobination of spinal
         cord, hindbrain, and midbrain maclean calls the neural
         chassis. it contains the basic neural machinery for
         reproduction and self-preservation, . . . maclean has
         distinguished three sorts of more recent brain
         structures controlling the neural chassis. the most
         ancient of them surround the midbrain. . . . we share
         it with the other mammals and the reptiles. it probably
         evolved several hundred million years ago. maclean
         calls it the reptilian or r-complex. surrounding the
         r-complex is the limbic system, so called because it
         borders on the underlying brain. our arms and legs are
         called limbs because they are peripheral to the rest of
         the body. we share the limbic system with other
         mammals, but not, in its full elaboration, with the
         reptiles. it probably evolved more than one hundred
         fifty million years ago. finally, surrounding the rest
         of the brain and clearly the most recent evolutionary
         accretion, is the neocortex.             --carl sagan
                                                  the dragons
                                                  of eden, new
                                                  york, random
                                                  house, 1977.
   pjc

[2] : WordNet (r) 2.0

limbic system
     n : a system of functionally related neural structures in the
         brain that are involved in emotional behavior syn: visceral
         brain, limbic brain
see also:
visceral brain limbic brain 

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