red mud

noun

1. : a marine offshore deposit deriving its yellow-brown to red-brown color from iron oxide

red mud … is most prevalent in the Yellow sea and off the coasts of Brazil — F.C.Lane

— compare blue mud

2. : a residue high in iron oxide resulting from purification of alumina in the Bayer process

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red mud noun

A type of industrial waste resulting from alumina processing, consisting of silicon oxide, iron oxide, etc

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Main Entry: ↑red

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red mud,

1. = red clay. (Cf. ↑red clay)

2. residue of impurities, such as silicon oxide and iron oxide resulting from the processing of alumina.