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hippocampus

/ˌhɪpəˈkæm.pəs/ noun C2
  1. A mythological creature with the front head and forelimbs of a horse and the rear of a fish.
  2. 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. · Holonyms: limbic system < brain < central nervous system, CNS

Plural hippocampi

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They found that a specific part of the brain called the hippocampus was significantly larger.
Mastering the Knowledge, p. 1 · B2
The longer someone had been driving a cab, the larger their hippocampus had grown.
Mastering the Knowledge, p. 1 · B2
These regions are the amygdala, which regulates emotional responses, and the hippocampus, which is responsible for the formation of associative memories.
The Scent of the Past, p. 1 · C1
The hippocampus, a seahorse-shaped structure nestled deep within the brain, plays an instrumental role in our spatial memory and navigation.
In Praise of the Paper Map, p. 1 · C2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.