Noun | 1. | hippocampus - 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 neural structure - a structure that is part of the nervous system limbic brain, limbic system, visceral brain - a system of functionally related neural structures in the brain that are involved in emotional behavior |
2. | ![]() fish genus - any of various genus of fish family Syngnathidae, Syngnathidae - pipefishes |