Webster's English Dictionary

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welterweight

wel.ter.weight \'wel-t*r-.wa-t\ n [3welter] 1: a weight of 28 pounds 
   sometimes imposed in a horse race in addition to w eight for age 2a: a 
   professional boxer or a wrestler weighing between 136 and 147 pounds  2b: 
   an intercollegiate boxer weighing between 136 and 145 pounds