killer (n.)someone who causes the death of a person or animal;
killer (n.)the causal agent resulting in death;
heart disease is the biggest killer in the United States
Synonyms: cause of death
killer (n.)a difficulty that is hard to deal with;
that exam was a real killer
killer (n.)predatory black-and-white toothed whale with large dorsal fin; common in cold seas;
Synonyms: killer whale /
orca /
grampus /
sea wolf /
Orcinus orca )window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}