opalescence
UK /ˌəʉpəˈlesəns/ US /ˌəʉpəˈlesəns/
noun 2
Definitions
noun
1
the state of being opalescent
2
the milky iridescent appearance of a dense transparent medium when it is illuminated by polychromatic visible radiation (such as sunlight) due to local fluctuations in its density and therefore in its refractive index
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