brainworm

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. (figuratively, informal)A song or melody that keeps playing inside of one's mind.

4. (derogatory, figuratively, slang, sometimes)A persistent delusion or obsession; a deeply-ingrained or unquestioned idea.

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• brain wormalternative
• brain-wormalternative