1) The river lamprey 
• (n.) The river lamprey (Ammocoetes, / Lampetra, fluviatilis).
Lam'pern noun [ See Lamprey .] (Zoology) The river lamprey ( Ammocœtes, or Lampetra, fluviatilis ). » The name is also applied to other river lampreys.
The Lampern or River Lamprey (Lampreta fluviatilis) is a European fish of the family Petromyzonidae. The Lampern is serpentine in shape, growing to about 40 cm in length, with a dark bluish grey or greyish green back and sides and a silvery white belly. Lamperns are found in the coastal waters of western Europe and Scandinavia migrating up European...