Source : Webster's Revised Unabridged Dictionary (1913)

Ocher \O"cher\, Ochre \O"chre\, n. [F. ocre, L. ochra, fr. Gr.
   ?, from (?) pale, pale yellow.] (Min.)
   (a) 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.
   (b) A metallic oxide occurring in earthy form; as, tungstic
       ocher or tungstite.

Ochre \O"chre\, n. (Min.)
   See {Ocher}.

Source : WordNet®

ochre
     adj : of a moderate orange-yellow color [syn: {ocher}]
     n 1: any of various earths containing silica and alumina and
          ferric oxide; used as a pigment [syn: {ocher}]
     2: a moderate yellow-orange to orange color [syn: {ocher}]