Meaning of grapefruit league

grape'fruit league"

Pronunciation: [key]
— Baseball Informal. Baseball Informal.
  1. a series of training games played by major-league teams before the opening of the season (so named because they take place in the citrus-growing South, as in Florida).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.