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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Dreis·se·na prop. n.  Zool. A genus of bivalve shells of which one species (Dreissena polymorpha) is often so abundant as to be very troublesome in the fresh waters of Europe.
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From: WordNet (r) 2.0

 Dreissena polymorpha
      n : inch-long mollusk imported accidentally from Europe; clogs
          utility inlet pipes and feeds on edible freshwater
          mussels [syn: zebra mussel]