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irisation

[ahy-ri-sey-shuh n] /ˌaɪ rɪˈseɪ ʃən/
noun
1.
the effect or quality of being iridescent; iridescence.
Origin
1850-1855
1850-55; iris + -ation
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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