Webster's English Dictionary

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bitumen

bi.tu.men \b*-'t(y)u:-m*n, bi--\ \-.t(y)u:-m*-n*-'za--sh*n\ 
   \-'t(y)u:-m*-.ni-z\ \-.no.id\ n [ME bithumen mineral pitch, fr. L bitumin-, 
   bitumen] 1: an asphalt of Asia Minor used in ancient times as a cement and 
   mortar  2: any of various mixtures of hydrocarbons (as tar) often together 
   with the ir nonmetallic derivatives - bi.tu.mi.ni.za.tion n