GNU Collaborative International Dictionary of English

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1.       
   Pompom, Pom-pom (?), n. [Imitative.] (Mil.) originally, 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.  More recently, the term is applied mostly to automatic antiaircraft cannons.
   
   [Webster 1913 Suppl. +PJC]