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the class of vertebrates comprising the lampreys, hagfishes, and several extinct forms, having no jaws or paired appendages.
Historical Examples

Radula with elongated and pointed teeth, like those of the Agnatha; a jaw present.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 Various


Read Also:

  • Agnathan

    any member of the vertebrate class . . noun any jawless eel-like aquatic vertebrate of the superclass Agnatha, which includes the lampreys and hagfishes adjective of, relating to, or belonging to the superclass Agnatha See also cyclostome agnathan (āg’nə-thən) Adjective Lacking a jaw. Noun See jawless fish.

  • Agnathia

    agnathia agnathia ag·na·thi·a (āg-nā’thē-ə) n. Congenital absence or partial absence of the lower jaw.

  • Agnathous

    having no jaws. belonging or pertaining to the class . Historical Examples agnathous: without jaws; specifically applied to those Neuropteroid series in which the mouth structures are obsolescent. Explanation of Terms Used in Entomology John. B. Smith adjective (zoology) (esp of lampreys and hagfishes) lacking jaws

  • Agnatic

    a relative whose connection is traceable exclusively through males. any male relation on the father’s side. related or akin through males or on the father’s side. allied or akin. Historical Examples If there were no children, then the inheritance passed to the agnatic kindred, and in default of the latter, to the gentiles. Ancient Society […]

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