bitumen
Concise Oxford English Dictionary © 2008 Oxford University Press:
bitumen /ˈbɪtjʊmən/
▶noun a black viscous mixture of hydrocarbons obtained naturally or as a residue from petroleum distillation, used for road surfacing and roofing.
– derivatives
bituminous adjective.
bituminous adjective.
– origin ME (denoting naturally occurring asphalt used as mortar): from L.
'bitumen' also found in these Oxford entries:

