The Collaborative International Dictionary of English v.0.48:

Lampern \Lam"pern\, n. [See Lamprey.] (Zool.)
   The river lamprey (Ammoc[oe]tes fluviatilis syn. Lampetra
   fluviatilis).
   [1913 Webster]

   Note: The name is also applied to other river lampreys.
         [1913 Webster]