sa·​cro·​il·​i·​ac | \ ˌsa-krō-ˈi-lē-ˌak How to pronounce sacroiliac (audio) , ˌsā- \

Definition of sacroiliac

 (Entry 1 of 2)

: of, relating to, or being the region of the joint between the sacrum and ilium sacroiliac pain



Definition of sacroiliac (Entry 2 of 2)

: the sacroiliac region also : its firm fibrous cartilage

Examples of sacroiliac in a Sentence

Recent Examples on the Web: Noun The sacroiliac joints are in the hip, where the spine and pelvis connect. Los Angeles Times, 13 May 2022 The goal is to avoid irritating the painful and stiff joints, like the sacroiliac joint, while preserving range of motion and strength in the joints that have to compensate in order to move well., 26 Jan. 2022 Doctors diagnosed Talansky with acute sacroilitis, an inflammation of the sacroiliac joint, which connects the pelvis to the spine. Lauren Steele, Outside Online, 17 July 2014 Your doctor will be looking for evidence both in the examination (like pain or stiffness) along with evidence from an imaging test, like inflammation of the sacroiliac joints (which connect the pelvis and lower spine) or fusion of vertebrae. Colleen Stinchcombe,, 24 Jan. 2022 According to Owen, the sacroiliac joints just beneath your spine that connect to the sacrum are similarly vulnerable, along with your wing-like hip bones. Holly Lebowitz Rossi, Good Housekeeping, 26 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sacroiliac.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of sacroiliac


1831, in the meaning defined above


1936, in the meaning defined above

History and Etymology for sacroiliac


probably from French sacro-iliaque, from New Latin sacrum + French iliaque iliac

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The first known use of sacroiliac was in 1831

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Cite this Entry

“Sacroiliac.” Dictionary, Merriam-Webster, Accessed 14 Aug. 2022.

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More Definitions for sacroiliac


sa·​cro·​il·​i·​ac | \ ˌsak-rō-ˈil-ē-ˌak How to pronounce sacroiliac (audio) , ˌsā-krō- How to pronounce sacroiliac (audio) \

Medical Definition of sacroiliac

 (Entry 1 of 2)

: of, relating to, affecting, or being the region of the joint between the sacrum and the ilium sacroiliac distress



Medical Definition of sacroiliac (Entry 2 of 2)

More from Merriam-Webster on sacroiliac Encyclopedia article about sacroiliac


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