From Longman Dictionary of Contemporary Englishcruiserweightcruis‧er‧weight /ˈkruːzəweɪt $ -zər-/ noun [countable] a boxer who weighs less than 86.18 kilograms, and who is heavier than a light heavyweight but lighter than a heavyweight
Examples from the Corpus
cruiserweight• The contest turned out more like a flyweight taking on a cruiserweight, with the referee on the cruiser's side. 