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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Agnatha is always a great word to know.

So is doohickey. Does it mean:

a gadget; dingus; thingumbob.

a chattering or flighty, light-headed person.

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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