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acanthodian

[ak-uh n-thoh-dee-uh n] /ˌæk ənˈθoʊ di ən/
noun
1.
any small, spiny-finned, sharklike fish of the extinct order Acanthodii, from the Paleozoic Era.
Origin of acanthodian
1850-1855
1850-55; < New Latin Acanthodi(i) plural of acanthodius (equivalent to Acanthod(es) a genus (< Greek akanthṓdēs prickly, spiny; see acanth-, -ode1) + Latin -ius) + -an
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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