grapefruit league noun in baseball, a notional league of the teams that conduct spring training in Florida US,1929
— Richard Scholl, RunningPressGlossaryofBaseballLanguage, p. 39, 1977
Tom Hamilton, Mike Hegan and Matt Underwood will do the first three games of the Grapefruit League season on March 5, 6 and 7[.] — PlainDealer, p. D6, 21 January 2004