1. superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms; [syn: Agnatha, superclass Agnatha]
WordNet (r) 3.0 (2006):
superclass Agnatha
n 1: superclass of eel-shaped chordates lacking jaws and pelvic
fins: lampreys; hagfishes; some extinct forms [syn:
Agnatha, superclass Agnatha]