Having fins composed of bony rays connected by a membrane, characteristic of modern fish species.
From actino- (ray) + -pterous (winged, finned, from Greek pteron). An older adjectival form describing the fin structure of most modern fish.
This seemingly technical term describes essentially every fish you'd catch in a lake or ocean—the ray-like structure of their fins is so elegant that boat designers have actually copied it to improve their propeller efficiency.
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