Acanthodian
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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- Acanthology
the study of spines, as in sea urchins or certain spiny-headed worms, particularly as they relate to taxonomic cl-ssification. 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 pr-ckle 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 b-ss 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 […]
- Acanthorrhexis
acanthorrhexis acanthorrhexis a·can·thor·rhex·is (ə-kān’thə-rěk’sĭs) n. rupture of the intercellular bridges of the pr-ckle cell layer of the epidermis, as in contact dermat-tis.