Pronunciation: (mid'l-wāt"), [key]
a boxer or other contestant intermediate in weight between a welterweight and a light heavyweight, esp. a professional boxer weighing up to 160 pounds (72.5 kg).
1. Boxing.of or pertaining to middleweights: the middleweight division.
2. (of a horse, esp. a hunter) able to carry up to 185 pounds (83.9 kg).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.