Definition of opalescent adjective from the Oxford Advanced Learner's Dictionary

 

opalescent

 adjective
adjective
BrE BrE//ˌəʊpəˈlesnt//
 
; NAmE NAmE//ˌoʊpəˈlesnt//
 
(formal or literary)
 
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changing colour like an opal an opalescent sky
See the Oxford Advanced American Dictionary entry: opalescent