GNU Collaborative International Dictionary of English

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1.       
   Bituminous , a. [L. bituminosus: cf. F. bitumineux.] Having the qualities of bitumen; compounded with bitumen; containing bitumen.
   1913 Webster
   Near that bituminous lake where Sodom flamed.
   Milton.
   
   1913 Webster
   Bituminous coal, a kind of coal which yields, when heated, a considerable amount of volatile bituminous matter. It burns with a yellow smoky flame. -- Bituminous limestone, a mineral of a brown or black color, emitting an unpleasant smell when rubbed. That of Dalmatia is so charged with bitumen that it may be cut like soap. -- Bituminous shale, an argillaceous shale impregnated with bitumen, often accompanying coal.
   1913 Webster