Pitch

The distance measured along the pitch line from center to center of teeth on a cogwheel. The slope of a roof. The distance from center to center of rivets. The distance between the adjacent threads of a screw. The degree of descent of a declivity. A thick, tenacious, black or dark-brown substance obtained by boiling down tar. The resinous sap that exudes from pines. Bitumen or asphaltum, especially when unrefined. To smear, cover, or treat with pitch.