(immunology) A natural killer cell

(immunology) Any cell that expresses cell surface receptors that deliver signals to either activate or inhibit a response as part of the innate immune system.

(business, US) A retailer that offers a wider selection of merchandise in a category than existing retailers, at lower prices, thereby gaining substantial share of the market and "killing" the existing retailers.

Someone or something, especially a sports team, that defeats a larger and superior opponent.

plural of killer whale

plural of killdeer

plural of killer bee

plural of killer game

plural of false killer whale

A dolphin of species Pseudorca crassidens, the sole species of genus Pseudorca and one of the larger dolphin species.