irisation
noun
iris·ation
ˌīrə̇ˈsāshən
plural -s
1
: the act or process of making iridescent
the irisation of a culture plate by developing bacteria
2
: iridescence
irisations in a cloud are evidence that it is composed of water droplets—D. W. Perrie
in the area of the sun beautiful irisations may occur
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Merriam-Webster unabridged
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