urostyle

[ yoor-uh-stahyl ]

noun

, Anatomy.

1. the fused vertebrae at the posterior end of the spinal column of some fishes and tailless amphibians.

urostyle

/ ˈjʊərəʊˌstaɪl /

noun

1. the bony rod forming the last segment of the vertebral column of frogs, toads, and related amphibians

Word History and Origins

Origin of urostyle¹

First recorded in 1870–75; uro- ² + -style ²

Word History and Origins

Origin of urostyle¹

C19: from uro- ² + Greek stulos pillar

Example Sentences

Urostyle, ū′rō-stīl, n. a prolongation backward of the last vertebra.—adj.

From Project Gutenberg

The main adaptive specializations of Anura, however, including loss of the adult tail, extreme reduction in number of vertebrae, formation of urostyle, elongation of the ilium and lengthening of the hind legs, must have appeared at a later time than the separation of that order from any possible common stem with Urodela, although they are only partially developed in the Triassic Protobatrachus.

From Project Gutenberg

Basiventral arcualia have been supposed to be represented by the hypochord, a median rod of cartilage beneath the shrinking notochord in the postsacral region, which at metamorphosis ossifies to produce the bulk of the urostyle.

From Project Gutenberg

Urostyle, the last vertebra, lying in the median line, a long, slender, blade-like bone, really formed by the fusion of several vertebr�.

From Project Gutenberg

As the tadpole approaches the frog stage the vertebral column in the tail is rapidly absorbed, and its vestiges appear in the adult as the urostyle.

From Project Gutenberg