sacroiliacPronunciation: /ˌseɪkrəʊˈɪlɪak, ˌsak-/Definition of sacroiliac 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. sacroiliac in other Oxford dictionaries Definition of sacroiliac in the US English dictionary
