wel ‧ ter ‧ weight /ˈweltəweɪt $ -ər-/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Origin: welter 'heavy rider or boxer' (19-20 centuries) (probably from welt 'to hit' (19-20 centuries) ) + weight ]
a ↑ boxer who weighs less than 66.68 kilograms, and who is heavier than a ↑ lightweight but lighter than a ↑ middleweight