Any of various fishes lacking jaws, including the hagfishes and the lampreys and many extinct groups, such as the ostracoderms.
American Heritage Medicine
(zoology) A member of the superclass Agnatha of jawless vertebrates.
- jawless fish
- jawless vertebrate
Lacking a jaw.
American Heritage Science
(zoology) Belonging or pertaining to the superclass Agnatha, the jawless vertebrates.
Other Word Forms of Agnathan
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