second brain

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second brain

noun second brains

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.
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
Similar: personal knowledge base, personal knowledge management, Zettelkasten, digital garden

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MLA

"second brain." Wiktionary, via Micwyn, micwyn.com/word/second%20brain. Accessed 6 Nov. 2026.

APA

second brain. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/second%20brain

Chicago

"second brain." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/second%20brain.

BibTeX

@misc{second_brain_2026,
  title = {second brain},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/second%20brain},
  urldate = {2026-11-06}
}