Having circular or ring-like fins or wing structures, particularly describing certain fish.
From Greek 'cyclo-' (circle) + 'pteron' (wing, fin) + '-ous' (possessing). This technical term describes the physical structure of certain aquatic animals.
Fish fins evolved from the same ancestor as your arms and legs—they're all modifications of paired limbs that nature repurposed for swimming, which is why we use the same '-pterous' root for different creatures!
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