lempedu

lempedu, f.n: a lamprey. (LEM-peh-duh / ˈlɛm-pɛ-dʌ)

Medieval manuscript illustration of a brown eel coiled up with a funny sort of grimace on its face.
Eel in Der Naturen Bloeme (I realise this may not be specifically a lamprey… feel free to share if you have a medieval lamprey pic); Flanders, c. 1350; Koninklijke Bibliotheek, KB, KA 16, f. 117r. [galerij.kb.nl]