Definition of sacrum noun from the Oxford Advanced Learner's Dictionary

 

sacrum

 noun
noun
BrE BrE//ˈseɪkrəm//
 
; NAmE NAmE//ˈseɪkrəm//
 
; BrE BrE//ˈsækrəm//
 
; NAmE NAmE//ˈsækrəm//
 
(pl. sacra
BrE BrE//ˈseɪkrə//
 
; NAmE NAmE//ˈseɪkrə//
 
, sacrums)
(anatomy)
 
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a bone in the lower back, between the two hip bones of the pelvis Word Origin mid 18th cent.: from Latin os sacrum, translation of Greek hieron osteon ‘sacred bone’ (from the belief that the soul resides in it).
See the Oxford Advanced American Dictionary entry: sacrum