noun
a bony fish of a large group distinguished by their fins, which are supported by rays
adjective
relating to or characteristic of actinopterygians
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The actinopterygian fishes are characterized by their bony rays in their fins.
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I learned about actinopterygian fishes in my marine biology class.
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Those actinopterygian fish are pretty cool to watch at the aquarium.
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The actinopterygian nature of the situation became clear as more information was revealed.