Matter-antimatter reaction assembly
A matter/antimatter reaction assembly (often known simply as an M/ARA) was a type of energy reactor which was fueled by injectors of matter and antimatter into a central reaction element, creating large amounts of energy when those two materials mutually annihilated each other. Matter and antimatter were injected into the M/ARA in an intermix ratio. The dilithium crystal is used to moderate this reaction. These types of power plants were commonly used as warp cores. () 

On  starships, the dilithium crystal converter assembly was a separate unit from the intermix chamber. It consisted of the matter/antimatter integrator or reactor which channeled the reactor energy to the dilithium crystal converter assembly to be energized into warp plasma for the warp engine nacelles. ()

The dilithium articulation frame was housed inside the M/ARA behind the dilithium chamber hatch. ()

On monitors it was also displayed as the matter/antimatter input system, () or the matter/antimatter reaction chamber ()

The prototype Jem'Hadar battleship had a fatal design flaw; the braces holding together the ship's M/ARA were vulnerable to a specific type of radiation. The crew of the  believed they could use this flaw to their advantage when they were plotting the ship's destruction in 2374. ()

In 2368, after the computer systems of the Enterprise-D were disrupted by a energy wave from a Satarran starship, Geordi La Forge accessed the basic system directories of the engineering department. According to the department, the matter-antimatter reaction assembly was off-line. ()

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Warp