[ ak-uh n-thoh-dee-uh n ]
/ ˌæk ənˈθoʊ di ən /
any small, spiny-finned, sharklike fish of the extinct order Acanthodii, from the Paleozoic Era.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for acanthodian
There is no evidence that the lateral row of spines in the acanthodian Climatius has any other than a defensive significance.