boxer

Short definition from Wiktionary

Noun

1. 1
   A participant in a boxing match; a fighter who boxes.
2. 2
   A type of internal combustion engine in which cylinders are arranged in two banks on either side of a single crankshaft.
3. 3
   The person running a game of two-up.
4. 4
   One who packs boxes.
5. 5
   A letterboxer.
6. 6
   Attributive form of boxers (“boxer shorts”).
7. 7
   A breed of stocky, medium-sized, short-haired dog with a square-jawed muzzle.
8. 8
   A Chinese anti-imperial and xenophobic rebel of the early 1900s.

Proper noun

1. 1
   A surname.