Word.ws English Dictionary

Plural of hippocampus

irregular plural

The plural of hippocampus is hippocampi or hippocampuses.

Forms of hippocampus

Singularhippocampus /ˌhɪpə(ʊ)ˈkæm.pəs/
Pluralhippocampi
hippocampuses
Countablecountable

Meaning of hippocampus

  1. noun A mythological creature with the front head and forelimbs of a horse and the rear of a fish.
  2. noun 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.

Full definition of hippocampus

Nouns ending in -us: plural -i

Questions about the plural of hippocampus

What is the plural of hippocampus?
The plural of hippocampus is hippocampi or hippocampuses.
Which is correct, hippocampi or hippocampuses?
Both are used. hippocampi is the more common of the two in English writing.
Is hippocampus countable?
Hippocampus is a countable noun.

Source and license

Adapted from Wiktionary: hippocampus (page history and authors) and the entries of its forms. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out forms marked obsolete, archaic, rare or dialectal and added the examples. Wiktionary data of 2026-09-02.

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Cite this page: “Plural of hippocampus.” Word.ws, https://word.ws/plural/hippocampus. Based on Wiktionary, CC BY-SA 4.0.