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English definition of “sacrum”

sacrum

noun [C] uk   /ˈseɪ.krəm/ us    /ˈsæk.rəm/ ( plural sacra or sacrums) specialized
a triangle-shaped bone at the base of the lower back above the coccyx ( =a small bone at the base of the spine)
(Definition of sacrum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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