agnathan

from WordNet (r) 3.0 (2006)

agnathan
    n 1: eel-shaped vertebrate without jaws or paired appendages
         including the cyclostomes and some extinct forms [syn:
         {jawless vertebrate}, {jawless fish}, {agnathan}]

from The Collaborative International Dictionary of English v.0.48

agnathan \agnathan\ n.
   1. an eel-shaped vertebrate without jaws or paired
      appendages; a member of the Agnatha. The group includes
      the cyclostomes and some extinct forms.

   Syn: jawless vertebrate, jawless fish
        [WordNet 1.5]