synsacrum

American

[sin-sak-ruhm, -sey-kruhm] / sɪnˈsæk rəm, -ˈseɪ krəm /

noun

Ornithology.

PLURAL

synsacra

a dorsal ridge of bone in the pelvic region of birds, formed by the fusion of certain thoracic, lumbar, sacral, and caudal vertebrae.

Other Word Forms

presynsacral adjective
synsacral adjective

Etymology

Origin of synsacrum

First recorded in 1900–05; syn- + sacrum

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The researchers, led by Dr Xing Xu of the Chinese Academy of Sciences, uncovered an incomplete skeleton of Xixianykus, which included seven vertebrae, the synsacrum, which is formed from fused vertebrae and helps carry the weight of the hind part of the animal, a few ribs, parts of the pelvic girdle and most of the right hindlimb.

From BBC

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023