urostyle

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urostyle

(ˈjʊərəʊˌstaɪl)
n
(Zoology) the bony rod forming the last segment of the vertebral column of frogs, toads, and related amphibians
[C19: from uro-2 + Greek stulos pillar]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

u•ro•style

(ˈyʊər əˌstaɪl)

n.
the fused vertebrae at the posterior end of the spinal column of tailless amphibians.
[1870–75]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.