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plural hippocampi or hippocampuses
(mythology) A mythological creature with the front head and forelimbs of a horse and the rear of a dolphin.
(neuroanatomy, anatomy) A part of the brain located inside the temporal lobe, consisting mainly of grey matter. It is a component of the limbic system and plays a role in memory and emotion. quotations examples
The hippocampus is central to the laying down of memories.
2019, Bill Bryson, The Body: A Guide for Occupants, Black Swan (2020), page 63