n. a class of eel-shaped chordates with a cartilaginous skeleton lacking jaws, scales, and pelvic fins. Among these are the lampreys and hagfishes. There are some extinct forms. Syn. -- class Agnatha. [ WordNet 1.5 ]
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 ]