‖Dreis″se‐na (?), n. [NL. Named after Dreyssen, a Belgian physician.] (Zoöl.) A genus of bivalve shells of which one species (D. polymorpha) is often so abundant as to be very troublesome in the fresh waters of Europe.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.