synsacrum Syllabification: (syn·sac·rum)Pronunciation: /sinˈsakrəm, -ˈsā-/Definition of synsacrum noun (plural synsacra /-ˈsakrə, -ˈsākrə/ or synsacrums) Zoology an elongated composite sacrum containing a number of fused vertebrae, present in birds and some extinct reptiles. synsacrum in other Oxford dictionaries Definition of synsacrum in the British & World English dictionary
