Etymology

brainworm

B3R1A1I1N1W4O1R1M3

Today it means: A neurotropic nematode parasite (Parelaphostrongylus tenuis). Full definition →

First used since 2008
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The story

From brain + worm.

First known use, by meaning

  • since 2008 A song or melody that keeps playing inside of one's mind.
  • 2010s A persistent delusion or obsession; a deeply-ingrained or unquestioned idea.

Etymology from Wiktionary, CC BY-SA 4.0.