killer

Forms

1.One who or that which kills.
- There’s a killer on the loose.
- My cat is a habitual bird killer.
- Carbon monoxide is a silent killer.
2.That which causes stress or is extremely difficult, especially that which may cause failure at a task.
- The final hill in the race course was a killer.
- That test was a killer.
3.Something that is so far ahead of its competition that it effectively kills off that competition.
- Digital streaming platforms are CD killers.
4.The killer whale.
- We once saw an attack made by three killers upon a cow whale and her calf, in a lagoon on the coast of California in the spring of 1858.
- This skull, which has all the appearance of being that of a full-grown animal, is just one quarter the length and breadth of the skull of the adult common Killer (Orca gladiator).

1.Excellent, very good, cool.(slang)
- It all says that Elephant's Memory is a killer band.
- That girl was dynamite. Dark hair with killer blue eyes, bronze skin, and an exquisite full-figured body.
- “Ahhh, Avery,” shouted the Yurtmeister after a full hour of intense volleyball. “That last serve was absolutely killer.”
2.Causing death, destruction, or obliteration.
3.Distressing, uncomfortable.
- I had a killer headache this morning.

Uncommon· #2306

From Middle English killer, kyller.

By surface analysis, kill + -er.