killer Definition

one that kills

killer whale

one that has a forceful, violent, or striking impact

strikingly impressive or effective

extremely difficult to deal with; also : causing death or devastation

a relatively small toothed whale (Orcinus orca of the family Delphinidae) that is black above with white underparts and white oval-shaped patches behind the eyes, attains a length of 20 to 30 feet (6 to 9 meters), typically hunts in groups, and preys chiefly on sea mammals (such as seals, sea lions, and other whales), large fish, and squid —called also orca

a computer application of such great value or popularity that it assures the success of the technology with which it is associated; broadly : a feature or component that in itself makes something worth having or using

africanized bee

a lymphocyte (such as a killer T cell or a natural killer cell) with cytotoxic activity

an aggressive tenacious urge for domination in a struggle to attain a set goal

a T cell that functions in cell-mediated immunity by destroying a cell (such as one infected with a virus) having specific antigenic molecules on its surface —called also cytotoxic T cell

a man who is extremely attractive to women

a large granular lymphocyte capable especially of destroying tumor cells or virally-infected cells without prior exposure to the target cell and without having it presented with or marked by a histocompatibility antigen —called also NK cell