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synsacral

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syn⋅sac⋅rum

[sin-sak-ruhm, -sey-kruhm]
–noun, plural -sac⋅ra [-sak-ruh, -sey-kruh] . Ornithology.
a dorsal ridge of bone in the pelvic region of birds, formed by the fusion of certain thoracic, lumbar, sacral, and caudal vertebrae.

Origin:
1900–05; syn- + sacrum


syn⋅sa⋅cral, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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