Definition of urostyle in English:

urostyle

noun

Zoology
  • A long bone formed from fused vertebrae at the base of the vertebral column in some lower vertebrates, especially frogs and toads.

    • ‘Anurans also have nine or fewer presacral vertebrae (usually eight), and the three or four posterior to the sacrum are fused into a rod called the urostyle.’
    • ‘The caudal vertebrae have been fused into a single rod-shaped skeletal element (the urostyle or coccyx) that lies between the ilia, in effect moving the tail internally.’

Pronunciation:

urostyle

/ˈjʊərə(ʊ)stʌɪl/