A warp injector refers to the matter and antimatter injectors collectively as part of a matter-antimatter reaction assembly.

These injectors release the deuterium and antideuterium into the warp core at opposite ends. The path of which is controlled by the magnetic constrictors until they combine and cause a matter-antimatter reaction, powering the warp drive. (ENT: "Cold Front"; VOY: "Caretaker", "Innocence", "Drone")