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hippocampus (n.)

c. 1600, a kind of sea monster, part horse and part dolphin or fish, often pictured pulling Neptune's chariot, from Late Latin hippocampus, from Greek hippokampos, from hippos "horse" (from PIE root *ekwo- "horse") + kampos "a sea monster," which is perhaps related to kampe "caterpillar." Used from 1570s as a name of a type of fish (the seahorse); of a part of the brain from 1706, on supposed resemblance to the fish.

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Definitions of hippocampus from WordNet
1
hippocampus (n.)
a complex neural structure (shaped like a sea horse) consisting of grey matter and located on the floor of each lateral ventricle; intimately involved in motivation and emotion as part of the limbic system; has a central role in the formation of memories;
2
Hippocampus (n.)
seahorses;
Synonyms: genus Hippocampus
From wordnet.princeton.edu