welterweight

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A weight division in professional boxing having an upper limit of 147 pounds (66.1 kilograms), between junior welterweight and junior middleweight.
• noun A boxer competing in this weight division.
• noun A contestant in various other sports in a similar weight division.

from The Century Dictionary.

• noun In wrestling or boxing, a weight coming between light- and middle- weight, usually 145 pounds or under.
• noun In horse-racing, an unusually heavy weight, especially as carried by horses in many steeple chases and hurdle-races. These weights some times amount to as much as 40 pounds over weight for age.

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Alternative spelling of welter-weight.
• noun Alternative spelling of welter-weight.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an amateur boxer who weighs no more than 148 pounds
• noun a weight of 28 pounds; sometimes imposed as a handicap in a horse race (such as a steeplechase)
• noun a wrestler who weighs 154-172 pounds
• noun a professional boxer who weighs between 141 and 147 pounds