Definition of ray-finned
: having fins supported by bony or horny rays (see ray entry 2 sense 5a(1)) : acanthopterygian The vast majority of ray-finned fish species are contained in the Teleostei, a clade noted for its diversity of behavior, functional morphology, and ecology in aquatic habitats throughout the world.— George V. Lauder, Quarterly Review of Biology, March 1999 Morays belong to a group called ray-finned fishes that includes a vast majority of fish species, like tuna, goldfish, salmon and trout.— Carl Zimmer, New York Times, 11 Sept. 2007 — compare lobe-finned
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