Antimatter warhead

From Memory Alpha, the free Star Trek reference.

An antimatter warhead was a type of warhead that contained explosive antimatter.

Photonic torpedoes were armed with antimatter warheads. The fact that the Earth Starfleet vessel Enterprise was using weapons with antimatter warheads in 2153 came as a surprise to the Klingons. (ENT: "The Expanse")

In 2373, the Maquis were known to have access to such weapons as antimatter warheads, tricobalt explosives and biogenic weapons. (DS9: "Blaze of Glory")