synsacrum

noun

syn·​sacrum

"+

: 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

Word History

Etymology

New Latin, from syn- + sacrum

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Rhymes for synsacrum

• sacrum
• simulacrum