illusion

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illusion oculogyral illusion optical illusion

Main Entry: il·lu·sion
Pronunciation: il-ü-zhn
Function: noun
1 : a misleading image presented as a visual stimulus
2 a : perception of something objectively existing in such a way as to cause misinterpretation of its actual nature; especially : OPTICAL ILLUSION -- compare DELUSION 2 b : HALLUCINATION 1 c : a pattern capable of reversible perspective
- il·lu·sion·al /-üzh-nl, -n-l/ adjective