The Collaborative International Dictionary of English v.0.48:

Pitch \Pitch\, n. [OE. pich, AS. pic, L. pix; akin to Gr. ?.]
   1. A thick, black, lustrous, and sticky substance obtained by
      boiling down tar. It is used in calking the seams of
      ships; also in coating rope, canvas, wood, ironwork, etc.,
      to preserve them.
      [1913 Webster]

            He that toucheth pitch shall be defiled therewith.
                                                  --Ecclus.
                                                  xiii. 1.
      [1913 Webster]

   2. (Geol.) See Pitchstone.
      [1913 Webster]

   Amboyna pitch, the resin of Dammara australis. See
      Kauri.

   Burgundy pitch. See under Burgundy.

   Canada pitch, the resinous exudation of the hemlock tree
      (Abies Canadensis); hemlock gum.

   Jew's pitch, bitumen.

   Mineral pitch. See Bitumen and Asphalt.

   Pitch coal (Min.), bituminous coal.

   Pitch peat (Min.), a black homogeneous peat, with a waxy
      luster.

   Pitch pine (Bot.), any one of several species of pine,
      yielding pitch, esp. the Pinus rigida of North America.
      [1913 Webster]

WordNet (r) 3.0 (2006):

mineral pitch
    n 1: a dark bituminous substance found in natural beds and as
         residue from petroleum distillation; consists mainly of
         hydrocarbons [syn: asphalt, mineral pitch]