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[yoo r-uh-stahyl] /ˈyʊər əˌstaɪl/
noun, Anatomy
the fused vertebrae at the posterior end of the spinal column of some fishes and tailless amphibians.
Origin of urostyle
1870-75; uro-2 + -style2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for urostyle
Historical Examples
  • The urostyle is the name given to a modified bony structure, originally the end of the notochord, turned upward in most fishes.

  • The urostyle is post-sacral and corresponds to three or more modified vertebrae.

    The Vertebrate Skeleton Sidney H. Reynolds
  • The post-sacral part of the spinal column ossifies continuously, forming an unsegmented cylindrical rod, the urostyle.

    The Vertebrate Skeleton Sidney H. Reynolds
  • In Anura the number of vertebrae is very greatly reduced, only nine and the urostyle being present.

    The Vertebrate Skeleton Sidney H. Reynolds
  • The ultimate changes of the notochord and urostyle vary very considerably in the different types of Teleostei.

  • The urostyle is a long rod-like bone forming the posterior unsegmented continuation of the vertebral column.

    The Vertebrate Skeleton Sidney H. Reynolds
  • The urostyle is a long cylindrical rod which articulates with the sacrum generally by two facets.

    The Vertebrate Skeleton Sidney H. Reynolds
British Dictionary definitions for urostyle


the bony rod forming the last segment of the vertebral column of frogs, toads, and related amphibians
Word Origin
C19: from uro-² + Greek stulos pillar
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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