Tar (noun)

1. A thick, dark, sticky substance obtained from the destructive distillation of coal, wood, or other organic matter.
2. A similar substance used for waterproofing or as a preservative.

Origin:

From old english teru, related to old norse tjara, and german teer.

Examples:

1. The roof was covered with tar to make it waterproof.
2. The workers used tar to fill the cracks in the road.
3. Tar was used to pave the road because it is durable and long-lasting.
4. The ship was coated with tar to protect the wood from rot.
5. The tar pits have preserved many prehistoric animals and plants.