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ochre . ( Of the lat. ) ochra, and this of the g ?(a, of ?, yellow). 1. m. earthy, despicable, ore of yellow color, which is an oxide of iron hydrated, often mixed with clay. It serves as an ore of iron and is used in painting. 2. m. Any earthy mineral that has yellow color. Ocre of antimony, bismuth, nickel. 3. m. Color of any of these minerals. ochre calcined, or ochre quemado. 1. m. That by the action of the fire becomes artificial almagre. ochre red. 1. m. almagre (? red oxide of iron). ochre roasted. 1. m. ochre calcined.