Synsacra

synsacrum

[sin-sak-ruhm, -sey-kruhm]
noun, plural synsacra [sin-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

synsacral, adjective
presynsacral, adjective
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