📖 WordNook

killer

noun
  1. predatory black-and-white toothed whale with large dorsal fin
    killer whale
  2. a difficulty that is hard to deal with
    “that exam was a real killer”
  3. someone who causes the death of a person or animal
    slayer
  4. the causal agent resulting in death
    “heart disease is the biggest killer in the United States”
    cause of death