Artificial intelligent assistant

rock-oil

rock-oil
  [rock n.1]
  Native naphtha.

1668 Charleton Onomast. 236 Rock oil, or Petroleum. 1802–3 tr. Pallas's Trav. (1812) II. 282 In the same country are springs, having inspissated rock-oil on their surface. 1839 Ure Dict. Arts 879 Rock-oil is very inflammable. 1856 Orr's Circle Sci., Pract. Chem. 482 An oil matter called rock-oil oozes out of the ground.

Oxford English Dictionary

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