Un·ser(ŭn′sər), Alfred Known as "Al." Born 1939.
American racecar driver who won the Indianapolis 500 four times between 1970 and 1987. His brother Bobby Unser (born 1934) and son Al Unser Jr. (born 1962) have both also won the Indianapolis 500 multiple times.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.