Definition of optical illusion in English:

optical illusion

Syllabification: op·ti·cal il·lu·sion

noun

1An experience of seeming to see something that does not exist or that is other than it appears.
More example sentences
  • Everyone, from young children to my 94 year-old grandmother, is fascinated by optical illusions.
  • For instance, a very nice test of a robotic vision system would be to see whether it was susceptible to the same optical illusions that we are.
  • This results in an optical illusion known as a mirage.
1.1Something that deceives the eye by appearing to be other than it is.
More example sentences
  • It is not an optical illusion or trick photography.
  • Consider the famous optical illusion of two identical lines where one has concave triangles at its edges whilst the other has convex triangles at either end.
  • The reason many thought it was magic was because the largest of the tattoos that covered its body, as well as the vast majority, were optical illusions, causing something of a hypnosis to occur with those who dared to stare long enough.

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Word of the day conspicuous
Pronunciation: kənˈspɪkjʊəs
adjective
clearly visible