flyweight

noun

1. a boxer or other contestant of the lightest competitive class, especially a professional boxer weighing up to 112 pounds (51 kg).

noun

1. 1. a professional boxer weighing not more than 112 pounds (51 kg)
   2. an amateur boxer weighing 48–51 kg (106–112 pounds)
   3. (as modifier)a flyweight contest
2. (in Olympic wrestling) a wrestler weighing not more than 115 pounds (52 kg)