Home › Words › S › sacroiliitissacroiliitissacroiliitis · noun — inflammation of the sacroiliac joint.Definition from Wiktionary (CC BY-SA 3.0).Among words judged in Lexicurio's Arena, sacroiliitis ranks #36,605 of 43,042 for Qualifying.EtymologyFrom sacroiliac + -itis.nouninflammation of the sacroiliac jointDefinitions & examples from Wiktionary (CC BY-SA 3.0).