noun
a class of extinct jawed fishes that lived from the Silurian to the Permian period
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The acanthodian fish lived during the Silurian and Devonian periods.
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Have you heard of those acanthodian fish that lived millions of years ago?
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Those acanthodian fish were like the rockstars of the ancient seas.
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Her sharp wit was like the spines of an acanthodian fish, always ready to defend her arguments.