• Webster's Revised Unabridged Dictionary
    • a Urosacral (Anat) Of or pertaining to both the caudal and sacral parts of the vertebral column; as, the urosacral vertebræ of birds.
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Century Dictionary and Cyclopedia
    • urosacral Situated between the sacrum and the coccyx; of or pertaining both to the sacrum and to the coccyx: as, the urosacral region. The term is specifically applied to the numerous equivocal vertebræ of the sacrarium of a bird, which are situated between the sacral vertebræ proper and the free candal or coccygeal vertebræ, and are ankylosed with one another, with the last true sacral vertebra, and to a greater or less extent with the ilia or ischia, or both.
    • n urosacral In ornithology, any vertebra of the urosacral region; any vertebra between the last true sacral and the first free caudal. See cuts under sacrarium and sacrum.
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Chambers's Twentieth Century Dictionary
    • adj Urosacral ū-rō-sā′kral pertaining to the sacrum and to the coccyx
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Webster's Revised Unabridged Dictionary
2d uro-, + sacral,