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(ō`kər), mixture of varying proportions of iron oxide and clay, used as a pigmentpigment,
substance that imparts color to other materials. In paint, the pigment is a powdered substance which, when mixed in the liquid vehicle, imparts color to a painted surface.
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. It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or as red ocher, the iron oxide being hematite. Ocher grades into sienna, a yellow-brown pigment containing a higher percentage of iron ore than ocher as well as some manganese dioxide; sienna grades into umber, which is darker brown and contains a higher percentage of manganese dioxide. Burnt sienna is brown or bright red; burnt umber is a darker brown than umber. Ocher is produced in the United States, in France (French ocher being of a very high grade), and in some other parts of Europe. Italy is a leading producer of sienna and umber, and Cyprus of umber.



a city and administrative center of Ocher Raion, Perm’ Oblast, RSFSR, located on the Ocher River, a tributary of the Kama. Terminus of a 23-km branch line originating at the Vereshchagino railroad station on the Kirov-Perm’ line. Population, 15,400 (1974). Ocher has a machine shop and a plant that produces pipelaying machines. It also has an industrial teachers technicum.


A yellow, brown, or red earthy iron oxide, or any similar earthy, pulverulent metallic oxides used as pigments.

ocher, ochre

A naturally occurring yellow-brown hydrated iron oxide; used as a pigment in paint and a filler in linoleum.


(US), ocher
a. a moderate yellow-orange to orange colour
b. (as adjective): an ochre dress