Dictionary![]() ![]() ac•an•tho•di•anPronunciation: (ak"un-thō'dē-un), [key] —n. any small, spiny-finned, sharklike fish of the extinct order Acanthodii, from the Paleozoic Era. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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