The Collaborative International Dictionary of English v.0.48:

paradiddle \paradiddle\ n.
   The sound of a drum (especially a snare drum) beaten rapidly
   and continuously.

   Syn: roll, drum roll.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

paradiddle
    n 1: the sound of a drum (especially a snare drum) beaten
         rapidly and continuously [syn: paradiddle, roll, drum
         roll]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "paradiddle":
   barrage, beat, beating, drum, drum music, drumbeat, drumfire,
   drumming, flutter, palpitation, patter, pitapat, pitter-patter,
   pound, pounding, pulsation, rat-a-tat, rat-tat, rat-tat-tat,
   rataplan, rattattoo, roll, rub-a-dub, ruff, ruffle, spatter,
   splutter, sputter, staccato, tat-tat, tattoo, throb, throbbing,
   thrum, thumping, tom-tom