Word.ws English Dictionary

second brains

second brains is the plural of second brain.

Meaning of second brain

Noun

second brain (plural second brains)

  1. (informal) The enteric nervous system.
    • Although our ‘second brain’ doesn't make executive decisions like our actual brain, the two do communicate back and forth via electrical impulses through a pathway of nerves—the gut-brain axis—and this pathway influences our endocrine, immune and neural systems.2018, Lee Holmes, Supercharge Your Gut: Supercharged Food, Allen & Unwin, →ISBN
  2. (colloquial) The practice of unloading information to digital storage, such as notetaking applications, and using software to ease and enhance one's mind's own use of such information; the applications, the associated data, and the practical use of them, collectively.
    • Near-synonyms: personal knowledge base, personal knowledge management, Zettelkasten, digital garden

Questions about second brains

What is second brains the plural of?
Second brains is the plural of second brain.

Words near second brains in the dictionary

  1. second basemen
  2. second bases
  3. second best
  4. second bests
  5. second brain
  6. second brains
  7. second breakfast
  8. second breakfasts
  9. second chance
  10. second chances
  11. second childhood

Source and license

Adapted from Wiktionary: second brains (page history and authors); second brain (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “second brains.” Word.ws, https://word.ws/second_brains. Based on Wiktionary, CC BY-SA 4.0.