Any part of a weapon (typically a bomb or missile) that separates from a parent munition before or during employment(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "submunition" in a sentence
"Cluster bombs, designed with "submunition" ordnance to set off a chain-reaction of explosions, became an important part of the US conventional military arsenal in the 1960s."
"They also inspected the remnants of a cluster submunition and interviewed witnesses to two other such attacks."
"Taiwan will also require asymmetrical weapons such as submunition carrying surface-to-surface missiles and electromagnetic launch or "rail gun" weapons, expected to be ready in a few years."