Killer - Definition

n 1: someone who causes the death of a person or animal [syn:
killer, slayer]
2: the causal agent resulting in death; "heart disease is the
biggest killer in the United States" [syn: cause of death,
killer]
3: a difficulty that is hard to deal with; "that exam was a real
killer"
4: predatory black-and-white toothed whale with large dorsal
fin; common in cold seas [syn: killer whale, killer,
orca, grampus, sea wolf, Orcinus orca]