noun. ['ˈkɪlɝ'] someone who causes the death of a person or animal.
noun. ['ˈkɪlɝ'] predatory black-and-white toothed whale with large dorsal fin; common in cold seas.
noun. ['ˈkɪlɝ'] a difficulty that is hard to deal with.
noun. ['ˈkɪlɝ'] the causal agent resulting in death.