Meaning of PETROLEUM in English

PETROLEUM

[noun] [U] - a dark thick oil obtained from under the ground, from which various substances including petrol, paraffin and diesel oil are producedPetroleum jelly is a clear, jelly-like substance made from petroleum, used as a base for medicines which are rubbed into the skin, and also for making parts in a machine move smoothly against each other.

Cambridge English vocab.      Кембриджский английский словарь.