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Answer for the clue "Choice to keep iodine by sick American around California? It’s deceptive ", 16 letters:
optical illusion

Word definitions for optical illusion in dictionaries

Wikipedia Word definitions in Wikipedia
An optical illusion (also called a montasir ) is an illusion caused by the eye and characterized by visually perceived images that differ from objective reality . The information gathered by the eye is processed in the brain to give a perception that does ...

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ Even better, the full Coliseum will not be an optical illusion . ▪ Even knowing what he did, Kirov found it difficult to see how the optical illusion had been managed. ▪ For once, the optical illusion experienced by sailors leaving ...

Wiktionary Word definitions in Wiktionary
n. An image that is visually deceptive or misleading.

WordNet Word definitions in WordNet
n. an optical phenomenon that results in a false or deceptive visual impression

Usage examples of optical illusion.

If it were magic, I could snap my finger and the rabbit would be its normal self again in a normal cage -- and then you would know you were witnessing an optical illusion.

It was an optical illusion of the quadrimanual locomotion-quaddies even looked more human in free fall.

For an instant Daniel thought the movement was an optical illusion.

He was a young male, earless, with smooth skin that was painted or tattooed in swirling colors and patterns that made the thranta rider himself look like an optical illusion.

Bey stared at those piercing eyes, and after a few seconds the unmoving features before him seemed to shift and flow, reassembling themselves like an optical illusion to a different and familiar pattern.