red mud

noun

Definition of red mud

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.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/red%20mud. Accessed 11 December 2019.

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