Home › Words › S › sigmoideumsigmoideumsigmoideum · noun — sigmoid colon.Definition from Wiktionary (CC BY-SA 3.0).Among words judged in Lexicurio's Arena, sigmoideum ranks #17,003 of 43,049 for Qualifying.nounsigmoid colonDefinitions & examples from Wiktionary (CC BY-SA 3.0).