'Dreissena' definitions:
Definition of 'Dreissena'
(from WordNet)
noun
Zebra mussels [syn: Dreissena, genus Dreissena]
Definition of 'Dreissena'
From: GCIDE
- Dreissena \Dreis"se*na\, prop. n. [NL. Named after Dreyssen, a Belgian physician.] (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. [1913 Webster]