/ ˈkrəʊmiəm; NAmE ˈkroʊ-/ noun
[ U ] ( symb Cr ) 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
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WORD ORIGIN
early 19th cent.: from chrome + -ium .