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- DictionaryKill·er/ˈkilər/
noun
- 1. a person or thing that kills: "police are still searching for the killer"
- 2. an extremely difficult or unpleasant thing: informal "that wind's a killer"
adjective
- 1. denoting a person or thing that kills: "a killer virus"
- 2. extremely difficult or unpleasant: informal "I woke up with a killer hangover"