from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Not bituminous.
from the GNU version of the Collaborative International Dictionary of English
- adj. Containing no bitumen; not bituminous.
from The Century Dictionary and Cyclopedia
- Lacking bitumen, as anthracite coal in contrast with bituminous coal.
non- + bituminous (Wiktionary)
This is, I believe, the only accessible, or at least available nonbituminous coal in the world; but the best substitute for it is the Welsh semi-bituminous coal, and this was chiefly used by the blockade-runners.