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From The Collaborative International Dictionary of English v.0.48:
Welterweight \Wel"ter*weight`\, n. 1. (Horse Racing) A weight of 28 pounds (one of 40 pounds is called a heavy welterweight) sometimes imposed in addition to weight for age, chiefly in steeplechases and hurdle races. [Webster 1913 Suppl.] 2. A boxer or wrestler whose weight is intermediate between that of a lightweight and that of a middleweight. [Webster 1913 Suppl.]