any small, spiny-finned, sharklike fish of the extinct order Acanthodii, from the Paleozoic Era.
Historical Examples

There is no evidence that the lateral row of spines in the acanthodian Climatius has any other than a defensive significance.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3 Various

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  • Acanthoid

    spiny; spinous. adjective resembling a spine; spiny acanthoid a·can·thoid (ə-kān’thoid’) adj. Shaped like a thorn or spine.

  • Acanthology

    the study of spines, as in sea urchins or certain spiny-headed worms, particularly as they relate to taxonomic classification. noun the scientific study of spines Word Origin Greek ‘thorn’

  • Acantholysis

    acantholysis acantholysis ac·an·thol·y·sis (āk’ān-thŏl’ĭ-sĭs, āk’ən-) n. pl. ac·an·thol·y·ses (-sēz’) Separation of individual prickle cells from their neighbors, as in keratosis follicularis.

  • Acanthoma

    acanthoma acanthoma ac·an·tho·ma (āk’ān-thō’mə, āk’ən-) n. pl. ac·an·tho·mas or ac·an·tho·ma·ta (-mə-tə) A tumor composed of epidermal squamous cells.

  • Acanthopterygian

    belonging or pertaining to the Acanthopterygii (Acanthopteri), the group of spiny-finned fishes, including the bass and perch. an acanthopterygian fish. Historical Examples acanthopterygian, ak-an-thop-tėr-ij′i-an, adj. having spiny fins. Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various adjective of, relating to, or belonging to the Acanthopterygii, a large group of teleost fishes having spiny […]

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