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1. Oxford American Dictionary

   Zöllner illusion

   • IPA[ˈzôlnər iˌlo͞oZHən]

   美式

   • n.
     an optical illusion in which long parallel lines appear to diverge or converge when crossed by rows of short oblique lines.

   • noun: Zöllner illusion, plural noun: Zöllner illusions