Wordnet 3.0
NOUN (2)
1. 
 weighs no more than 115 pounds; 
2. 
 an amateur boxer who weighs no more than 112 pounds; 
WordNet (r) 3.0 (2006):
flyweight
    n 1: weighs no more than 115 pounds
    2: an amateur boxer who weighs no more than 112 pounds
Moby Thesaurus II by Grady Ward, 1.0:
22 Moby Thesaurus words for "flyweight":
   Chinese boxer, bantamweight, black belt, boxer, brown belt,
   bruiser, catchweight, featherweight, fighter, fisticuffer,
   heavyweight, karate expert, light heavyweight, lightweight,
   middleweight, palooka, prizefighter, pug, pugilist, savate expert,
   sparrer, welterweight