noun, plural hippocampi [hip-uh-kam-pahy, -pee] .
Classical Mythology. a sea horse with two forefeet, and a body ending in the tail of a dolphin or fish.
Anatomy. an enfolding of cerebral cortex into the lateral fissure of a cerebral hemisphere, having the shape in cross section of a sea horse.

1600–10; < Latin < Greek hippókampos, equivalent to hippo- hippo- + kámpos sea monster

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World English Dictionary
hippocampus (ˌhɪpəʊˈkæmpəs)
n , pl -pi
1.  a mythological sea creature with the forelegs of a horse and the tail of a fish
2.  See sea horse any marine teleost fish of the genus Hippocampus, having a horselike head
3.  an area of cerebral cortex that forms a ridge in the floor of the lateral ventricle of the brain, which in cross section has the shape of a sea horse. It functions as part of the limbic system
[C16: from Latin, from Greek hippos horse + kampos a sea monster]

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American Heritage
Medical Dictionary

hippocampus hip·po·cam·pus (hĭp'ə-kām'pəs)
n. pl hip·po·cam·pi (-pī')
The complex, internally convoluted structure that forms the medial margin of the cortical mantle of the cerebral hemisphere, borders the choroid fissure of the lateral ventricle, is composed of two gyri with their white matter, and forms part of the limbic system.

hip'po·cam'pal (-pəl) adj.
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American Heritage
Science Dictionary
hippocampus   (hĭp'ə-kām'pəs)  Pronunciation Key 
Plural hippocampi (hĭp'ə-kām'pī')
A convoluted, seahorse-shaped structure in the cerebral cortex of the temporal lobe of the brain, composed of two gyri with white matter above gray matter. It forms part of the limbic system and is involved in the processing of emotions and memory.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The communication between the two brain areas at this time is one way, from the
  hippocampus to the neocortex.
The hippocampus does so, encoding the firing sequence in the cortex and thereby
  consolidating the memory.
The researchers also found that there was far more jumping-gene activity in the
  hippocampus than in the caudate nucleus.
The hippocampus is known to play a role in long-term memory formation, while
  the amygdala is an emotional center in the brain.
Images for hippocampus
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