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plural impactors
Any of several machines or devices in which a part impacts on another, or on a material. examples
An object which impacts another. quotations examples
Although Dr. Bottke remains unconvinced that the impactor had a cometary origin, he noted that the asteroid explanation also raised many exciting and unresolved questions.
2021 February 15, Becky Ferreira, “Where Did the Dinosaur-Killing Impactor Come From?”, in The New York Times