noun
bitumen
bih-TOO-mun/bɪˈtuːmən/
A black, sticky petroleum material used in road surfaces and roofing.
Thick black bitumen stretches from the spreading blade toward the open pail.
Etymology
Latin bitumen named mineral pitch and was applied by Roman writers to substances including asphalt and petroleum. The English meaning retains that association with pitch-like petroleum materials.
In context
Now we get to the star ingredient, bitumen. That's the same black sticky stuff that holds all the stone together.