Definition of sacrum noun from the Oxford Advanced American Dictionary

 

sacrum

 noun
noun
NAmE//ˈsækrəm//
 
, NAmE//ˈseɪkrəm//
 
(pl. sacra
NAmE//ˈsækrə//
 
, NAmE//ˈseɪkrə//
 
or sacrums)
(anatomy)
 
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a bone in the lower back, between the two hip bones of the pelvis
See the Oxford Advanced Learner's Dictionary entry: sacrum