hippocampus

noun
hip·​po·​cam·​pus | \ˌhi-pə-ˈkam-pəs \
plural hippocampi\ ˌhi-​pə-​ˈkam-​ˌpī , -​(ˌ)pē \

Definition of hippocampus 

: a curved elongated ridge that extends over the floor of the descending horn of each lateral ventricle of the brain, that consists of gray matter covered on the ventricular surface with white matter, and that is involved in forming, storing, and processing memory

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Other Words from hippocampus

hippocampal \ ˌhi-​pə-​ˈkam-​pəl \ adjective

Examples of hippocampus in a Sentence

Recent Examples on the Web

All the while, electrodes were recording the brain’s activity, tracking the firing patterns in the hippocampus when the patient guessed right and wrong. Robbie Gonzalez, WIRED, "A Brain-Boosting Prosthesis Moves From Rats to Humans," 6 Apr. 2018 The hippocampus, a curved structure shaped like the seahorse it is named after, plays a role in learning and memory. Darby Saxbe, Scientific American, "Living with Neighborhood Violence May Shape Teens’ Brains," 15 June 2018 And without it, the parts of the brain that deal with attachment and fear — the amygdala and hippocampus — develop differently. William Wan, Washington Post, "What separation from parents does to children: ‘The effect is catastrophic’," 18 June 2018 These effects might be due to stress hormones that flood the developing brain and affect the growth of neural structures like the hippocampus and amygdala. Darby Saxbe, Scientific American, "Living with Neighborhood Violence May Shape Teens’ Brains," 15 June 2018 Even before Alzheimer's disease steals memories, the condition begins to change the density and volume of the hippocampus and the entorhinal cortex, memory-making structures that lie at the heart of the medial temporal lobe. Melissa Healy, latimes.com, "Too much sitting may thin the part of your brain that's important for memory, study suggests," 13 Apr. 2018 Most of the excess was found in the hippocampus, a region of the brain involved in memory, but not in other regions of the brain, nor in a completely different organ like the heart, suggesting a very specific impact on brain mosaicism. Robert Martone, Scientific American, "Early Life Experience: It’s in Your DNA," 10 July 2018 How does the hippocampus store distinct memories of similar events? Sally Jenkins, chicagotribune.com, "How is LeBron James always one move ahead? Let's ask the scientists.," 18 May 2018 And without it, the parts of the brain that deal with attachment and fear - the amygdala and hippocampus - develop differently. William Wan, BostonGlobe.com, "What separation from parents does to children: ‘The effect is catastrophic’," 19 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hippocampus.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of hippocampus

1695, in the meaning defined above

History and Etymology for hippocampus

New Latin, from Greek hippokampos seahorse, from hippos horse + kampos sea monster — more at equine

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Last Updated

10 Oct 2018

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The first known use of hippocampus was in 1695

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More Definitions for hippocampus

hippocampus

noun
hip·​po·​cam·​pus | \ˌhip-ə-ˈkam-pəs \
plural hippocampi\ -​ˌpī , -​(ˌ)pē \

Medical Definition of hippocampus 

: a curved elongated ridge that is an important part of the limbic system, extends over the floor of the descending horn of each lateral ventricle of the brain, consists of gray matter covered on the ventricular surface with white matter, and is involved in forming, storing, and processing memory — see pes hippocampi

More from Merriam-Webster on hippocampus

Nglish: Translation of hippocampus for Spanish Speakers

Britannica.com: Encyclopedia article about hippocampus

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