[fer-oh-mang-guh-nees, -neez]
a ferroalloy containing up to 90 percent manganese.

1880–85; ferro- + manganese

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World English Dictionary
ferromanganese (ˌfɛrəʊˈmæŋɡəˌniːz)
an alloy of iron and manganese, used in making additions of manganese to cast iron and steel

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Example sentences
Geologic characteristics and geographic distribution of potential cobalt-rich ferromanganese crusts deposits in the area.
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