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A petrodollar is a United States dollar earned by a country through the sale of its petroleum (oil) to another country. The term was coined in 1973 by Georgetown University economics professor, Ibrahim Oweiss, who recognized the need for a term that could describe the dollar received by petroleum exporting countries (OPEC) in exchange for oil.
The term petrodollar should not be confused with petrocurrency which refers to the actual national currency of each petroleum exporting country.
Large inflow of petrodollar in a country often has an impact on the value of its currency. For Canada it was shown that an increase of 10% in the price of oil increases the Canadian dollar value versus the US dollar by 3% and vice versa.