Definitions
1.NounOne 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.NounThat which causes stress or is extremely difficult, especially that which may cause failure at a task."That test was a killer.; The final hill in the race course was a killer."
3.NounSomething that is so far ahead of its competition that it effectively kills off that competition."Digital streaming platforms are CD killers."
4.NounThe killer whale.
5.NounA remarkably impressive person or thing.
6.NounA knockout form of darts or pool involving several players.
7.NounA club used for killing fish.
8.NounA particularly heavy type of handstamp, or portion of one, often obscuring a large part of the postage stamp.
9.NounSynonym of virama (“kind of diacritical mark”).
10.AdjectiveExcellent, very good, cool."killer feature; killer view"
11.AdjectiveCausing death, destruction, or obliteration."killer bee; killer robot"
12.AdjectiveDistressing, uncomfortable."I had a killer headache this morning."