brainworm

Noun

Meaning

A neurotropic nematode parasite (Parelaphostrongylus tenuis).

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

(figuratively, informal) A song or melody that keeps playing inside of one's mind. [since 2008]
Synonym: earworm

(figuratively, slang, sometimes derogatory) A persistent delusion or obsession; a deeply-ingrained or unquestioned idea. [2010s]

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