stunner

Short definition from Wiktionary

Noun

1. 1
   Anything that is stunning.
2. 2
   Anything that is stunning: A woman or man of stunning beauty or handsomeness (often hyperbolic), a knockout.
3. 3
   A professional wrestling maneuver in which an attacking wrestler applies a facelock to an opponent and falls to a seated position, forcing the opponent's jaw or neck to drop on the attacker's shoulder.
4. 4
   A pistol firing a beam capable of stunning an enemy.
5. 5
   A person or machine that stuns an animal before slaughter.