killer has definitions from the field of zoology
1
[ noun ] someone who causes the death of a person or animal

Synonyms

slayer

Used in print

(Hampton Stone, The Man Who Looked Death...)

`` Also , if you 're going_to believe those prints , you 'll have to look_for a killer who 's a top-grade piano_player '' .

If Rose_Mallory 's killer acted this way , catching_up_with him was going_to be a cinch .

The killer , if in our present group , would certainly be interested in knowing that much , and even_though with the fingerprint evidence what it was I could see no way he could use this bit of information to improve on his situation , there might always be some way .

2
[ noun ] the causal agent resulting in death

Synonyms

cause_of_death

Examples

"heart disease is the biggest killer in the United States"

Related terms

causal_agent kill

3
[ noun ] a difficulty that is hard to deal with

Examples

"that exam was a real killer"

Related terms

difficulty kill

4
[ noun ] (zoology) predatory black-and-white toothed whale with large dorsal fin; common in cold seas

Related terms

dolphin Orcinus

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