1. Someone skilled in the use of a rifle
   "The expert rifler hit the target with precision"
    
2. A soldier whose weapon is a rifle
   "The rifler took up position at the edge of the trench"
    
3. One who rifles or robs; a thief or plunderer
   "The rifler made off with valuable artifacts from the museum"

Derived forms: riflers

Type of: crack shot, pongo [Brit, informal], sharpshooter, soldier