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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The bones in a fish that support the dorsal fin. There are two to three of them: proximal, middle, and distal; In spinous fins the distal is often fused to the middle or not present at all.

from The Century Dictionary and Cyclopedia

  • n. In fishes, one of the nodules of bone or cartilage between the dorsal and anal rays and their respective interspinous bones.


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