Noah Webster's Dictionary 1. (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. 2. (n.) A metallic oxide occurring in earthy form; as, tungstic ocher or tungstite. 3. (n.) See Ocher. Int. Standard Bible Encyclopedia OCHRE, RED o'-ker, (Isaiah 44:13, "He marketh it out with a pencil," margin "red ochre," the King James Version "line"; seredh, a word found only here, and of unknown etymology): Designates the implement used by the carpenter to mark the wood after measuring and before cutting. "Red ochre" supposes this to have been a crayon (as does "pencil"), but a scratch-awl is quite as likely. Ochre is clay colored by an iron compound.