noun
a type of fish belonging to the order Acanthopterygii, characterized by spiny fins
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The acanthopteran fish species have spiny fin rays that distinguish them from other fish.
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Those acanthopteran fish with the spiky fins are pretty cool to look at.
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Check out that funky acanthopteran fish with the spikes on its back!
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The acanthopteran nature of his personality made him stand out in a crowd.