ˈpämˌpäm noun
( -s )
Etymology: imitative
1.
a. : a fully automatic carriage-mounted 37 millimeter gun firing explosive shells and used by both sides during the Boer War
b. : a usually fully automatic gun of 20 to 40 millimeters usually firing explosive shells and mounted on ships in pairs, fours, or eights — called also Chicago piano
2.
[by alteration]
: pompon