Definitions

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.

Etymologies

non- +‎ bituminous (Wiktionary)

Examples

  • 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.

    The Narrative of a Blockade-Runner

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