Definition of synsacrum in English:

synsacrum

Line breaks: syn|sacrum
Pronunciation: /sɪnˈseɪkrəm
 
, sɪnˈsakrəm/

noun (plural synsacra /-krə/ or synsacrums)

Zoology
  • An elongated composite sacrum containing a number of fused vertebrae, present in birds and some extinct reptiles.
    More example sentences
    • The posterior thoracic vertebrae, synsacrum, and hindlimb are pneumatized by diverticula of the abdominal air sacs.
    • In most birds, diverticula of the abdominal air sacs pneumatize the posterior thoracic vertebrae and synsacrum later in ontogeny.
    • Between the notarium and synsacrum were several dorsal vertebrae that may have provided some level of dorsoventral mobility.

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