A metreon wave was a type of weapon using metreon particles.
In 2402, Toral, son of Duras used a metreon wave to destroy Federation Outpost 15, killing thousands in an incredibly painful manner. Toral then threatened to unleash the wave on Cygnus III if Ambassador Alexander Rozhenko did not commit suicide. (TNG short story: "Staying the Course")
- It is unknown if the metreon wave was meant to be a reference to the metreon cascade.