pine tar

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A viscous or semisolid brown-to-black substance produced by the destructive distillation of pine wood and used in roofing compositions and as an expectorant and antiseptic.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A dark viscous substance obtained from the destructive distillation of pine wood.
• noun baseball Such a material or a similar material used by batters to improve their grip.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a dark viscous substance obtained from the destructive distillation of pine wood