Eurodollar

Eurodollars are deposits denominated in United States dollars at banks outside the United States, and thus are not under the jurisdiction of the Federal Reserve. Consequently, such deposits are subject to much less regulation than similar deposits within the United States, allowing for higher margins. There is nothing "European" about Eurodollar deposits; a US dollar-denominated deposit in Tokyo or Caracas would likewise be deemed Eurodollar deposits. Neither is there any connection with the euro currency.More generally, the "euro" prefix can be used to indicate any currency held in a country where it is not the official currency: for example, euroyen or even euroeuro.

History:Gradually, after the Second World War, the amount of U.S. dollars outside the United States increased enormously, both as a result of the Marshall Plan and as a result of imports into the U.S., which had become the largest consuming market after peace was reestablished in Europe.
As a result, enormous sums of U.S. dollars were in custody of foreign banks outside the United States. Some foreign countries, including the Soviet Union, also had deposits in U.S. dollars in American banks, granted by certificates.
During the Cold War period, especially after the invasion of Hungary in 1956, the Soviet Union feared that its deposits in North American banks would be frozen as a retaliation. It decided to move some of its holdings to the Moscow Narodny Bank, a Soviet-owned bank with a British charter. The British bank would then deposit that money in the US banks. There would be no chance of confiscating that money, because it belonged to the British bank and not directly to the Soviets. On February 28, 1957, the sum of $800,000 was transferred, creating the first eurodollars. Initially dubbed "Eurbank dollars" after the bank's telex address, they eventually became known as "eurodollars"as such deposits were at first held mostly by European banks and financial institutions.
Gradually, as a result of the successive commercial deficits of the United States, the eurodollar market expanded worldwide.