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Douglas Harper's Etymology Dictionary
petrodollar

1974, "surplus of petroleum exports over imports of all other goods," as a notational unit of currency (in reference to OPEC nations), formed in English from petro- (2) + dollar.

Wiktionary
petrodollar

n. Money earned from the sale of oil.

Usage examples of "petrodollar".

I told her to forget this doctor nonsense and talk more reasonably about the oilman and his petrodollars and what he had her do.

Saudi Arabia has used its petrodollars to fund the internationalization of its state creed, and that includes every Muslim country in the world, including the place of my birth.

But the president declared that petrodollars could not fund the creation of a socialist state as quickly as he wished.

Mexico no longer had the flow of petrodollars to meet the interest payments, the orgy of greed ended.