ochre

n. (us ocher) 1 earth used as yellow, brown, or red pigment. 2 pale brownish-yellow colour.  ochreous adj. [greek okhra]

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.