/ Thesaurus / S Synonyms of superclass agnatha Find synonyms for: Noun1. Agnatha, superclass Agnatha, classusage: superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct formsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language