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Ochre (n.) 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.
Ochre (n.) A metallic oxide occurring in earthy form; as, tungstic ocher or tungstite.
Ochre (n.) See Ocher.