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.

2. A boxer or wrestler whose weight is intermediate between that of a lightweight and that of a middleweight.

Source: Webster's Revised Unabridged Dictionary (1913)