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say it: KIL-ur
killer is a noun meaning "someone who causes the death of a person or animal". It carries 4 recorded senses.
someone who causes the death of a person or animal
the causal agent resulting in death
“heart disease is the biggest killer in the United States”
predatory black-and-white toothed whale with large dorsal fin; common in cold seas
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for killer come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.