- 1. n. 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. Source: opted
- 2. n. Plumbago, or black lead. Source: opted
- 3. (a) 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. (b) Plumbago, or black lead. Source: webster
- 4. n. 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. n. Plumbago, or black lead. Source: ecdict
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blackoxidealuminabarytadifferentearthyironleadlimemanganesemixtureocheroxidesplumbagoseveralsilicatherevarietieswater