what is definition of RTR
RTR may refer to: 1  Remember The Ronin, The registered trademark (RTR) of the American paintball company Remember The Ronin.. 2  Roll Tide Roll, the chant of the University of Alabama's Crimson Tide. Remember The Ronin, The registered trademark (RTR) of the American paintball company Remember The Ronin.. 2  Roll Tide Roll, the chant of the University of Alabama's Crimson Tide. 3  Advanced and retracted tongue root (ATR and RTR), contrasting states of the root of the tongue during the pronunciation of vowels.