IPA: /ˈsleɪər/
KK: /ˈsleɪər/
A person who kills or destroys, often used in a dramatic or heroic context.
The dragon slayer became a legend in the village for his bravery.
Slayer → It is formed from "slay" (from Old English *slēan*, meaning to strike or kill) and "-er" (meaning a person who). A slayer is a person who strikes down or kills.
Think of someone who 'strikes' ('slēan') to 'kill' — that's why a slayer is a person who kills.