A rod-like bone composed of fused tail vertebrae, present in frogs and toads (Halliday 1987).
• (n.) A styliform process forming the posterior extremity of the vertebral column in some fishes and amphibians.
urostyle A styliform process forming the posterior extremity of the vertebral column in some fish and tailess amphibians.
the fused vertebrae at the posterior end of the spinal column of some fishes and tailless amphibians.