From The Collaborative International Dictionary of English v.0.48 [gcide]:
1. (Min.) (a) A impure earthy ore of iron or a ferruginous clay, usually red (hematite) or yellow (limonite), -- used as a pigment in making paints, etc. The name is also applied to clays of other colors. (b) A metallic oxide occurring in earthy form; as, tungstic ocher or tungstite.
From WordNet (r) 3.0 (2006) [wn]:
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