Biol. [f. URO-2 + Gr. στῦλος pillar.] The posterior unsegmented portion of the vertebral column in certain fishes and amphibians.
1875. Huxley & Martin, Elem. Biol., 183. The commencement of the canal of the urostyle. Ibid., 204–6.
1878. F. J. Bell, Gegenbaur’s Comp. Anat., 433. A long dagger-shaped bony piece … ordinarily known as the urostyle.
1888. Rolleston & Jackson, Anim. Life, 94. The last or terminal caudal vertebra … has the centrum prolonged into the urostyle.
