Definition of Prussian blue noun from the Oxford Advanced Learner's Dictionary

 

Prussian blue

 noun
noun
BrE BrE//ˌprʌʃn ˈbluː//
 
; NAmE NAmE//ˌprʌʃn ˈbluː//
 
[uncountable]
 
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a deep blue colour used in paints
See the Oxford Advanced American Dictionary entry: Prussian blue