Definition of verdigris noun from the Oxford Advanced Learner's Dictionary

 

verdigris

 noun
noun
BrE BrE//ˈvɜːdɪɡriː//
 
; NAmE NAmE//ˈvɜːrdɪɡriː//
 
; BrE BrE//ˈvɜːdɪɡriːs//
 
; NAmE NAmE//ˈvɜːrdɪɡriːs//
 
[uncountable]
 
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the greenish substance which forms, for example on roofs, when copper reacts with the air Word Origin Middle English: from Old French verte-gres, earlier vert de Grece ‘green of Greece’.
See the Oxford Advanced American Dictionary entry: verdigris