pompom \pom"pom`\, pom-pom \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

pompom \pom"pom`\, n.
   an ornamental ball or tuft of wool, feathers, or other fluffy
   material used as a decoration on clothing such as hats and
   slippers.
   pjc

   2. a pompon.
      pjc
see also:
pompon 

pompon \pom"pon\, n. f.
   1. any trifling ornament for a woman's dress or bonnet.
      1913 webster

   2. mil. a tuft or ball of wool, or the like, sometimes worn
      by soldiers on the front of the hat such as a shako,
      instead of a feather.
      1913 webster +pjc

   3.
      a a hardy garden chrysanthemum having buttonlike heads
          of flowers.
      b any of several dwarf varieties of the provence rose.
          webster 1913 suppl.

   4. the globe-shaped flower head characteristic of certain
      plants such as dahlias and chrysanthemums.
      pjc

   5. a ball-shaped cluster of ribbons or streamers held in the
      hand and waved by some cheerleaders at team sports
      contests. see pompom girl. called also pompom.
      pjc
see also:
pompom girl pompom 

pom-pom
     n 1: decoration consisting of a ball of tufted wool or silk;
          usually worn on a hat syn: pompon
     2: artillery designed to shoot upward at airplanes syn: antiaircraft,
         antiaircraft gun, flak, flack, ack-ack, ack-ack
        gun
see also:
pompon antiaircraft antiaircraft gun flak flack ack-ack 
ack-ack gun