Real Dictionary

Gulf Stream in American English
warm ocean current flowing from the Gulf of Mexico along the E coast of the U.S., and turning east at the Grand Banks toward Europe: c. 50 mi (80 km) wide
noun: a warm ocean current flowing N from the Gulf of Mexico, along the E coast of the U.S., to an area off the SE coast of Newfoundland, where it becomes the western terminus of the North Atlantic Current

Gulf Stream in British English
noun: a relatively warm ocean current flowing northeastwards off the Atlantic coast of the US from the Gulf of Mexico