[1] : The Collaborative International Dictionary of English v.0.48

bituminous \bitu"minous\, 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
see also:
bituminous coal bituminous limestone bituminous shale 

[2] : WordNet (r) 2.0

bituminous
     adj : resembling or containing bitumen; "bituminous coal"

Bituminous >> B Words
Bituminous, definition of term: Bituminous
bituminous_pag1.html

Bituminous Coal >> B Words
Bituminous Coal, definition of term: Bituminous Coal
bituminous+coal_pag1.html