Webster's English Dictionary

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sacrum

sa.crum \'sak-r*m, 'sa--kr*m\ \'sak-r*, 'sa--kr*\ n or sa.cra [NL, fr. LL 
   os sacrum last bone of the spine, lit., holy bone] pl  : the part of the 
   vertebral column that is directly connected with or form s a part of the 
   pelvis and in man consists of five united vertebrae