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brainworm.

A neurotropic nematode parasite (Parelaphostrongylus tenuis).

9 characters2 syllables approx.English language

Meaning & usage

noun
  1. A neurotropic nematode parasite (Parelaphostrongylus tenuis).

  2. Any parasitic, worm-like species that inhabits the brain of another organism, typically altering its behaviour or giving it special abilities.

  3. A song or melody that keeps playing inside of one's mind.

    figuratively · informal
  4. A persistent delusion or obsession; a deeply-ingrained or unquestioned idea.

    derogatory · figuratively · slang · sometimes
Where this word comes from

From brain + worm.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.