1. [ noun ] someone who causes the death of a person or animal
Synonyms: slayer
Related terms: person murderer executioner garroter exterminator regicide poisoner suicide murder
2. [ noun ] the causal agent resulting in death
Synonyms: cause_of_death

"heart disease is the biggest killer in the United States"

Related terms: causal_agent kill
3. [ noun ] a difficulty that is hard to deal with

"that exam was a real killer"

Related terms: difficulty kill
4. [ noun ] (zoology) predatory black-and-white toothed whale with large dorsal fin; common in cold seas
Synonyms: orca grampus sea_wolf Orcinus_orca killer_whale
Related terms: dolphin Orcinus
Similar spelling:   kilroy