What is a basic definition of killer? A killer is a person or thing that kills, meaning they end lives. Killer is also used in slang to mean something that is devastating or exhausting. Additionally, killer is used in …

A killer is someone or something that kills, such as a murderer or a serial killer. Killer may also refer to:

KILLER definition: 1. someone who kills another person: 2. something that kills people, especially a disease or other…. Learn more.

1. One that kills: a disease that was a killer of thousands; a killer of new ideas. 2. Slang Something that is extremely difficult to deal with or withstand: an exam that was a real killer.

A killer is a person who has killed someone, or who intends to kill someone. The police are searching for his killers. He's a psychopath, a killer.

Definition of killer noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Nov 21, 2025 · There’s no shortage of serial killers who have shot to infamy over the course of U.S. history. We’re taking a look back at the crimes of Ted Bundy, Ed Gein, John Wayne Gacy, Jeffrey …

Dec 4, 2016 · The meaning of KILLER is one that kills. How to use killer in a sentence.

KILLER meaning: 1 : a person or thing that kills someone or something; 2 : something that is very difficult

Dec 19, 2025 · noun the causal agent resulting in death “heart disease is the biggest killer in the United States” synonyms: cause of death see more