(forestry) Synonym of widow-maker (“dangerous broken tree limb”)

(Ireland, Northern England) Something or someone that spoils an otherwise enjoyable event.

A sudoku variant where the grid also contains cages which must sum to the total where indicated, without repeating any digit within the cage.

plural of killer sudoku

Alternative form of deal breaker

Alternative form of nigger killer

(immunology) A cytotoxic T cell.

plural of killer T 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.

plural of false killer whale