sacrum
noun
sa·crum ˈsa-krəm 
ˈsā-
ˈsā- plural sacra ˈsa-krə
ˈsā-
: the part of the spinal column that is directly connected with or forms a part of the pelvis and in humans consists of five fused vertebrae
Example Sentences
Recent Examples on the Web In May 2017, the singer-songwriter and actress announced that she was diagnosed with breast cancer that had metastasized to the sacrum. 
Amethyst Tate, Peoplemag, 19 Aug. 2022 Young Shaylie had suffered a broken jaw in two places, a broken neck in two places, a broken femur, a fractured sacrum and a brain injury. Fox News, 14 July 2022 My sacrum attachment and / or glute max area got very sore towards the end of workout. Outside Online, 28 Oct. 2019 The protagonist grows a scruff of coarse hair above her sacrum and sniffs out bunnies in her yard; playtime with her son involves licking and biting. Hillary Kelly, Vulture, 15 Dec. 2021 O’Donnell suffered a broken sacrum, the triangular bone between the hip bones, a broken right foot and too many fractures of his pelvic region for the doctors to even count, his wife said. Jesse Leavenworth, courant.com, 5 Oct. 2021 The sacrum consists of two vertebrae that form a large triangular bone at the bottom of the spine, acting as a wedge between the hip bones. BostonGlobe.com, 27 Dec. 2019 The tight fusion of vertebrae at the hip-spine connection—called the sacrum—also became unfused and more flexible. Riley Black, Smithsonian, 11 Dec. 2019 The pelvis, too, has a tendency to be shown warped and curvy as if combined with the sacrum into a single semi-circular unit. Jack Hartnell, Time, 30 Oct. 2019 See More
Amethyst Tate, Peoplemag, 19 Aug. 2022 Young Shaylie had suffered a broken jaw in two places, a broken neck in two places, a broken femur, a fractured sacrum and a brain injury. Fox News, 14 July 2022 My sacrum attachment and / or glute max area got very sore towards the end of workout. Outside Online, 28 Oct. 2019 The protagonist grows a scruff of coarse hair above her sacrum and sniffs out bunnies in her yard; playtime with her son involves licking and biting. Hillary Kelly, Vulture, 15 Dec. 2021 O’Donnell suffered a broken sacrum, the triangular bone between the hip bones, a broken right foot and too many fractures of his pelvic region for the doctors to even count, his wife said. Jesse Leavenworth, courant.com, 5 Oct. 2021 The sacrum consists of two vertebrae that form a large triangular bone at the bottom of the spine, acting as a wedge between the hip bones. BostonGlobe.com, 27 Dec. 2019 The tight fusion of vertebrae at the hip-spine connection—called the sacrum—also became unfused and more flexible. Riley Black, Smithsonian, 11 Dec. 2019 The pelvis, too, has a tendency to be shown warped and curvy as if combined with the sacrum into a single semi-circular unit. Jack Hartnell, Time, 30 Oct. 2019 See More Word History
Etymology
New Latin, from Late Latin os sacrum last bone of the spine, literally, holy bone, translation of Greek hieron osteon
First Known Use
1753, in the meaning defined above
Medical Definition
sacrum
noun
sa·crum ˈsak-rəm ˈsā-krəm
ˈsā-krəm plural sacra ˈsak-rə ˈsā-krə
ˈsā-krə : the part of the spinal column that is directly connected with or forms a part of the pelvis by articulation with the ilia and that in humans forms the dorsal wall of the pelvis and consists of five fused vertebrae diminishing in size to the apex at the lower end which bears the coccyx