The history and homology of the os paradoxum or dumb-bell-shaped bone of the platypus Ornithorhynchus anatinus (Mammalia, Monotremata)
Anatomy In Motion - sacrum (n.) bone at the base of the spine, 1753, from Late Latin os sacrum "sacred bone," from Latin os "bone" (see osseous) + sacrum, neuter of sacer "
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