Meaning

• A sticky, gummy substance secreted by trees; sap.

  "It is hard to get this pitch off my hand."

• A dark, extremely viscous material remaining in still after distilling crude oil and tar.

  "It was pitch black because there was no moon."

• Pitchstone.

Meaning

• To cover or smear with pitch.

• To darken; to blacken; to obscure.