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

 

iridescent

 adjective
adjective
BrE BrE//ˌɪrɪˈdesnt//
 
; NAmE NAmE//ˌɪrɪˈdesnt//
 
(formal)
 
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showing many bright colours that seem to change in different lights a bird with iridescent blue feathers Word Origin late 18th cent.: from Latin iris, irid- ‘rainbow’ + -escent.
See the Oxford Advanced American Dictionary entry: iridescent