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

 

chromium

 noun
noun
BrE BrE//ˈkrəʊmiəm//
 
; NAmE NAmE//ˈkroʊmiəm//
 
[uncountable](symbol Cr)
 
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a chemical element. Chromium is a hard grey metal that shines brightly when polished and is often used to cover other metals in order to prevent them from rusting. chromium-plated steel Word Origin early 19th cent.: from chrome + -ium.
See the Oxford Advanced American Dictionary entry: chromium

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