dictionary help<chemical>
An earthy oxide of manganese, or mixture of different oxides and water, with some oxide of iron, and often silica, alumina, lime, or baryta; black ocher. There are several varieties.
Plumbago, or black lead.
(01 Mar 1998)
Wachter, Herman, wacky, Wada, J, Wada test < Prev | Next > wadding, Waddington, waddingtonian homeostasis
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