iridescent

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ir·i·des·cent

(ir'i-des'ent),
Presenting multiple bright refractile colors, typically as a result of optical interference when incident white light is broken into its spectral components when reflected back through several thin-layered films.
[G. iris, rainbow]
Farlex Partner Medical Dictionary © Farlex 2012

iridescent

Presenting a rainbow-like play of colours as in soap bubbles.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann