sigmoidPronunciation: /ˈsɪgmɔɪd/Definition of sigmoid adjective 1curved like the uncial sigma; crescent-shaped. 2S-shaped. noun Anatomy short for sigmoid colon.Derivatives sigmoidal adjective Origin: late 17th century: from Greek sigmoeidēs, from sigma (see sigma)sigmoid in other Oxford dictionaries Definition of sigmoid in the US English dictionary
