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lampern

British  
/ ˈlæmpən /

noun

  1. Also called: river lamprey.  a migratory European lamprey, Lampetra fluviatilis, that spawns in rivers

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of lampern

C14 laumprun, from Old French, from lampreie lamprey