Definitions

1. adjective

relating to or containing bitumen; covered with or resembling bitumen

“The bituminous coal mine had been operating for decades.”

2. noun

a type of coal that contains a high percentage of bitumen

“The bituminous coal was used to generate electricity.”

3. noun

bitumen or a bituminous substance, especially as used in roadmaking

“The road was paved with a layer of bituminous material.”

4. adverb

in a manner characteristic of bitumen or bituminous substances

“The bituminous tar was poured onto the road surface.”