Meaning of “killer” in the English Dictionary

"killer" in British English

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uk /ˈkɪl.ər/ us /ˈkɪl.ɚ/

killer noun (DEATH)

B1 [ C ] someone who kills another person:

Police are still hoping to find the dead woman's killer.

[ C ] something that kills people, especially a disease or other illness:

Cancer and heart disease are the UK's biggest killers.

[ C ] something that destroys something:

This chemical is found in most weedkillers.

More examples

adjective [ before noun ] uk us

a killer disease
killer bees

(Definition of “killer” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"killer" in American English

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killernoun [ C ]

us /ˈkɪl·ər/

someone or something that causes someone or something to die:

The police haven’t found the killer yet.
Heart disease is a killer (= cause of death).

infml If something is described as a killer, it is very difficult:

The test was a real killer.

infml A killer is also someone or something that is very entertaining or skilled:

Dizzy was a killer on the trumpet.

(Definition of “killer” from the Cambridge Academic Content Dictionary © Cambridge University Press)