McGwire[mə-gwīrˈ], Mark David Born 1963.
McGwire definition by American Heritage Dictionary
, Mark David Born 1963.
American baseball player. In 1987 he broke the single-season record for home runs hit by a rookie, and in 1998 he set a new record for home runs hit in one season, surpassing Roger Maris and Sammy Sosa, by hitting 70.