coaltar
nounUK /ˈkəʊl.tɑːr/
US /ˈkoʊl.tɑːr/
A thick dark liquid made from coal that is used to make roads and protect wood.
The workers spread coaltar on the road to keep it smooth.
OTHER MEANINGS
2. A dark, sticky substance used in some medicines to treat skin problems.
The doctor gave him a coaltar shampoo for his scalp.
3. A byproduct left over when coal is heated to make gas or coke.
The factory collected coaltar as a byproduct of making coke.
4. A thick liquid used to coat and protect roofs and fences.
They painted the fence with coaltar to keep the rain out.