pe ‧ tro ‧ le ‧ um /pəˈtrəʊliəm, pɪˈtrəʊliəm $ -ˈtroʊ-/ BrE AmE noun [uncountable]
[ Date: 1500-1600 ; Language: Medieval Latin ; Origin: petroleum , from Latin petr- (from Greek petra 'rock' ) + oleum ( ⇨ ↑ oil 1 ) ]
oil that is obtained from below the surface of the Earth and is used to make petrol, ↑ paraffin , and various chemical substances:
petroleum-based products