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synsacrum
noun
syn·sacrum
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Definition of synsacrum
: a solidly fused series of vertebrae in the pelvic region in birds, dinosaurs, and pterosaurs comprising usually the last rib-bearing or thoracic vertebra, the two sacral vertebrae, and a varying number of caudal vertebrae — compare sacrum
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Origin and Etymology of synsacrum
New Latin, from syn- + sacrum
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