"hippocampus" in the noun sense
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
2. Hippocampus, genus Hippocampus
seahorses
Source: WordNet® (An amazing lexical database of English)
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