Longman Dictionary of Contemporary English homepage

killer

1 noun
     
kill‧er1 [countable]
1 a person, animal, or thing that kills:
Heart disease is America's number one killer.
the hunt for her killers
weed killer

➔ serial killer

at serial2 (1)
2 informal something or someone that is very difficult, tiring, or boring:
The new project is a killer.
3 informal something that is very exciting or impressive:
I'm not saying the film is a killer, but it's cool.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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