pred- +

(Latin: prey, booty, plunder)

preyer
1. Someone who, or that which, preys on others; a plunderer; a waster; a devourer.
2. An animal that feeds on another animal as a matter of habit or preference.
preying
1. Killing an animal in order to eat it.
2. Committing a crime against someone: "The police are looking for street gangs who are preying on tourists."
3. Taking or getting something by violence.
4. Taking by force from an enemy in war; spoiling; plundering.