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

 

bullion

 noun
noun
BrE BrE//ˈbʊliən//
 
; NAmE NAmE//ˈbʊliən//
 
[uncountable]
 
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gold or silver in large amounts or in the form of bars gold bullion Word Origin Middle English: from Anglo-Norman French, in the sense ‘a mint’, variant of Old French bouillon, based on Latin bullire ‘to boil’.
See the Oxford Advanced American Dictionary entry: bullion