Pom-pom
Pronunciation : Pom"-pom`
Part of Speech : n.
Definition : Defn: A Vickers-Maxim one-pounder automatic machine cannon using metallic ammunition fed from a lopped belt attached to the gun; -- popularly so called from its peculiar drumming sound in action. Sometimes, any of other similar automatic cannons.
[Imitative.]
Source : Webster's Unabridged Dictionary, 1913