sacroiliacEnglishOxford Dictionary of Englishsacroiliac /ˌseɪkrəʊˈɪliak , ˌsakrəʊˈɪliak / ▸ adjective Anatomy relating to the sacrum and the ilium. ▪ denoting the rigid joint at the back of the pelvis between the sacrum and the ilium.
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EnglishOxford Dictionary of English