Agnatha

Agnatha

[ag-nuh-thuh]
noun
the class of vertebrates comprising the lampreys, hagfishes, and several extinct forms, having no jaws or paired appendages.

Origin:
1875–80; < Neo-Latin, equivalent to Greek a- a-6 + -gnatha, neuter plural of -gnathos -gnathous

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
agnatha

noun
superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms 
WordNet® 3.0, © 2006 by Princeton University.
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