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Meaning of acanthodian

ac•an•tho•di•an

Pronunciation: (ak"un-thō'dē-un), [key]
— n.
  1. 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.